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source/blender/nodes/geometry/nodes/node_geo_curve_to_mesh.cc

  • This file was copied to source/blender/geometry/intern/curve_to_mesh_convert.cc.
/* /*
* This program is free software; you can redistribute it and/or * This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License * modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2 * as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version. * of the License, or (at your option) any later version.
* *
* This program is distributed in the hope that it will be useful, * This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of * but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details. * GNU General Public License for more details.
* *
* You should have received a copy of the GNU General Public License * You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation, * along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/ */
#include "BLI_array.hh"
#include "BLI_float4x4.hh"
#include "BLI_task.hh"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "BKE_material.h"
#include "BKE_mesh.h"
#include "BKE_spline.hh" #include "BKE_spline.hh"
#include "GEO_curve_to_mesh.hh"
#include "UI_interface.h" #include "UI_interface.h"
#include "UI_resources.h" #include "UI_resources.h"
#include "node_geometry_util.hh" #include "node_geometry_util.hh"
namespace blender::nodes { namespace blender::nodes {
static void geo_node_curve_to_mesh_declare(NodeDeclarationBuilder &b) static void geo_node_curve_to_mesh_declare(NodeDeclarationBuilder &b)
{ {
b.add_input<decl::Geometry>("Curve"); b.add_input<decl::Geometry>("Curve");
b.add_input<decl::Geometry>("Profile Curve"); b.add_input<decl::Geometry>("Profile Curve");
b.add_output<decl::Geometry>("Mesh"); b.add_output<decl::Geometry>("Mesh");
} }
/** Information about the creation of one curve spline and profile spline combination. */
struct ResultInfo {
const Spline &spline;
const Spline &profile;
int vert_offset;
int edge_offset;
int loop_offset;
int poly_offset;
int spline_vert_len;
int spline_edge_len;
int profile_vert_len;
int profile_edge_len;
};
static void vert_extrude_to_mesh_data(const Spline &spline,
const float3 profile_vert,
MutableSpan<MVert> r_verts,
MutableSpan<MEdge> r_edges,
const int vert_offset,
const int edge_offset)
{
Span<float3> positions = spline.evaluated_positions();
for (const int i : IndexRange(positions.size() - 1)) {
MEdge &edge = r_edges[edge_offset + i];
edge.v1 = vert_offset + i;
edge.v2 = vert_offset + i + 1;
edge.flag = ME_LOOSEEDGE;
}
if (spline.is_cyclic() && spline.evaluated_edges_size() > 1) {
MEdge &edge = r_edges[edge_offset + spline.evaluated_edges_size() - 1];
edge.v1 = vert_offset;
edge.v2 = vert_offset + positions.size() - 1;
edge.flag = ME_LOOSEEDGE;
}
for (const int i : positions.index_range()) {
MVert &vert = r_verts[vert_offset + i];
copy_v3_v3(vert.co, positions[i] + profile_vert);
}
}
static void mark_edges_sharp(MutableSpan<MEdge> edges)
{
for (MEdge &edge : edges) {
edge.flag |= ME_SHARP;
}
}
static void spline_extrude_to_mesh_data(const ResultInfo &info,
MutableSpan<MVert> r_verts,
MutableSpan<MEdge> r_edges,
MutableSpan<MLoop> r_loops,
MutableSpan<MPoly> r_polys)
{
const Spline &spline = info.spline;
const Spline &profile = info.profile;
if (info.profile_vert_len == 1) {
vert_extrude_to_mesh_data(spline,
profile.evaluated_positions()[0],
r_verts,
r_edges,
info.vert_offset,
info.edge_offset);
return;
}
/* Add the edges running along the length of the curve, starting at each profile vertex. */
const int spline_edges_start = info.edge_offset;
for (const int i_profile : IndexRange(info.profile_vert_len)) {
const int profile_edge_offset = spline_edges_start + i_profile * info.spline_edge_len;
for (const int i_ring : IndexRange(info.spline_edge_len)) {
const int i_next_ring = (i_ring == info.spline_vert_len - 1) ? 0 : i_ring + 1;
const int ring_vert_offset = info.vert_offset + info.profile_vert_len * i_ring;
const int next_ring_vert_offset = info.vert_offset + info.profile_vert_len * i_next_ring;
MEdge &edge = r_edges[profile_edge_offset + i_ring];
edge.v1 = ring_vert_offset + i_profile;
edge.v2 = next_ring_vert_offset + i_profile;
edge.flag = ME_EDGEDRAW | ME_EDGERENDER;
}
}
/* Add the edges running along each profile ring. */
const int profile_edges_start = spline_edges_start +
info.profile_vert_len * info.spline_edge_len;
for (const int i_ring : IndexRange(info.spline_vert_len)) {
const int ring_vert_offset = info.vert_offset + info.profile_vert_len * i_ring;
const int ring_edge_offset = profile_edges_start + i_ring * info.profile_edge_len;
for (const int i_profile : IndexRange(info.profile_edge_len)) {
const int i_next_profile = (i_profile == info.profile_vert_len - 1) ? 0 : i_profile + 1;
MEdge &edge = r_edges[ring_edge_offset + i_profile];
edge.v1 = ring_vert_offset + i_profile;
edge.v2 = ring_vert_offset + i_next_profile;
edge.flag = ME_EDGEDRAW | ME_EDGERENDER;
}
}
/* Calculate poly and corner indices. */
for (const int i_ring : IndexRange(info.spline_edge_len)) {
const int i_next_ring = (i_ring == info.spline_vert_len - 1) ? 0 : i_ring + 1;
const int ring_vert_offset = info.vert_offset + info.profile_vert_len * i_ring;
const int next_ring_vert_offset = info.vert_offset + info.profile_vert_len * i_next_ring;
const int ring_edge_start = profile_edges_start + info.profile_edge_len * i_ring;
const int next_ring_edge_offset = profile_edges_start + info.profile_edge_len * i_next_ring;
const int ring_poly_offset = info.poly_offset + i_ring * info.profile_edge_len;
const int ring_loop_offset = info.loop_offset + i_ring * info.profile_edge_len * 4;
for (const int i_profile : IndexRange(info.profile_edge_len)) {
const int ring_segment_loop_offset = ring_loop_offset + i_profile * 4;
const int i_next_profile = (i_profile == info.profile_vert_len - 1) ? 0 : i_profile + 1;
const int spline_edge_start = spline_edges_start + info.spline_edge_len * i_profile;
const int next_spline_edge_start = spline_edges_start +
info.spline_edge_len * i_next_profile;
MPoly &poly = r_polys[ring_poly_offset + i_profile];
poly.loopstart = ring_segment_loop_offset;
poly.totloop = 4;
poly.flag = ME_SMOOTH;
MLoop &loop_a = r_loops[ring_segment_loop_offset];
loop_a.v = ring_vert_offset + i_profile;
loop_a.e = ring_edge_start + i_profile;
MLoop &loop_b = r_loops[ring_segment_loop_offset + 1];
loop_b.v = ring_vert_offset + i_next_profile;
loop_b.e = next_spline_edge_start + i_ring;
MLoop &loop_c = r_loops[ring_segment_loop_offset + 2];
loop_c.v = next_ring_vert_offset + i_next_profile;
loop_c.e = next_ring_edge_offset + i_profile;
MLoop &loop_d = r_loops[ring_segment_loop_offset + 3];
loop_d.v = next_ring_vert_offset + i_profile;
loop_d.e = spline_edge_start + i_ring;
}
}
/* Calculate the positions of each profile ring profile along the spline. */
Span<float3> positions = spline.evaluated_positions();
Span<float3> tangents = spline.evaluated_tangents();
Span<float3> normals = spline.evaluated_normals();
Span<float3> profile_positions = profile.evaluated_positions();
GVArray_Typed<float> radii = spline.interpolate_to_evaluated(spline.radii());
for (const int i_ring : IndexRange(info.spline_vert_len)) {
float4x4 point_matrix = float4x4::from_normalized_axis_data(
positions[i_ring], normals[i_ring], tangents[i_ring]);
point_matrix.apply_scale(radii[i_ring]);
const int ring_vert_start = info.vert_offset + i_ring * info.profile_vert_len;
for (const int i_profile : IndexRange(info.profile_vert_len)) {
MVert &vert = r_verts[ring_vert_start + i_profile];
copy_v3_v3(vert.co, point_matrix * profile_positions[i_profile]);
}
}
/* Mark edge loops from sharp vector control points sharp. */
if (profile.type() == Spline::Type::Bezier) {
const BezierSpline &bezier_spline = static_cast<const BezierSpline &>(profile);
Span<int> control_point_offsets = bezier_spline.control_point_offsets();
for (const int i : IndexRange(bezier_spline.size())) {
if (bezier_spline.point_is_sharp(i)) {
mark_edges_sharp(
r_edges.slice(spline_edges_start + info.spline_edge_len * control_point_offsets[i],
info.spline_edge_len));
}
}
}
}
static inline int spline_extrude_vert_size(const Spline &curve, const Spline &profile)
{
return curve.evaluated_points_size() * profile.evaluated_points_size();
}
static inline int spline_extrude_edge_size(const Spline &curve, const Spline &profile)
{
/* Add the ring edges, with one ring for every curve vertex, and the edge loops
* that run along the length of the curve, starting on the first profile. */
return curve.evaluated_points_size() * profile.evaluated_edges_size() +
curve.evaluated_edges_size() * profile.evaluated_points_size();
}
static inline int spline_extrude_loop_size(const Spline &curve, const Spline &profile)
{
return curve.evaluated_edges_size() * profile.evaluated_edges_size() * 4;
}
static inline int spline_extrude_poly_size(const Spline &curve, const Spline &profile)
{
return curve.evaluated_edges_size() * profile.evaluated_edges_size();
}
struct ResultOffsets {
Array<int> vert;
Array<int> edge;
Array<int> loop;
Array<int> poly;
};
static ResultOffsets calculate_result_offsets(Span<SplinePtr> profiles, Span<SplinePtr> curves)
{
const int total = profiles.size() * curves.size();
Array<int> vert(total + 1);
Array<int> edge(total + 1);
Array<int> loop(total + 1);
Array<int> poly(total + 1);
int mesh_index = 0;
int vert_offset = 0;
int edge_offset = 0;
int loop_offset = 0;
int poly_offset = 0;
for (const int i_spline : curves.index_range()) {
for (const int i_profile : profiles.index_range()) {
vert[mesh_index] = vert_offset;
edge[mesh_index] = edge_offset;
loop[mesh_index] = loop_offset;
poly[mesh_index] = poly_offset;
vert_offset += spline_extrude_vert_size(*curves[i_spline], *profiles[i_profile]);
edge_offset += spline_extrude_edge_size(*curves[i_spline], *profiles[i_profile]);
loop_offset += spline_extrude_loop_size(*curves[i_spline], *profiles[i_profile]);
poly_offset += spline_extrude_poly_size(*curves[i_spline], *profiles[i_profile]);
mesh_index++;
}
}
vert.last() = vert_offset;
edge.last() = edge_offset;
loop.last() = loop_offset;
poly.last() = poly_offset;
return {std::move(vert), std::move(edge), std::move(loop), std::move(poly)};
}
static AttributeDomain get_result_attribute_domain(const MeshComponent &component,
const AttributeIDRef &attribute_id)
{
/* Only use a different domain if it is builtin and must only exist on one domain. */
if (!component.attribute_is_builtin(attribute_id)) {
return ATTR_DOMAIN_POINT;
}
std::optional<AttributeMetaData> meta_data = component.attribute_get_meta_data(attribute_id);
if (!meta_data) {
/* This function has to return something in this case, but it shouldn't be used,
* so return an output that will assert later if the code attempts to handle it. */
return ATTR_DOMAIN_AUTO;
}
return meta_data->domain;
}
/**
* The data stored in the attribute and its domain from #OutputAttribute, to avoid calling
* `as_span()` for every single profile and curve spline combination, and for readability.
*/
struct ResultAttributeData {
GMutableSpan data;
AttributeDomain domain;
};
static std::optional<ResultAttributeData> create_attribute_and_get_span(
MeshComponent &component,
const AttributeIDRef &attribute_id,
AttributeMetaData meta_data,
Vector<OutputAttribute> &r_attributes)
{
const AttributeDomain domain = get_result_attribute_domain(component, attribute_id);
OutputAttribute attribute = component.attribute_try_get_for_output_only(
attribute_id, domain, meta_data.data_type);
if (!attribute) {
return std::nullopt;
}
GMutableSpan span = attribute.as_span();
r_attributes.append(std::move(attribute));
return std::make_optional<ResultAttributeData>({span, domain});
}
/**
* Store the references to the attribute data from the curve and profile inputs. Here we rely on
* the invariants of the storage of curve attributes, that the order will be consistent between
* splines, and all splines will have the same attributes.
*/
struct ResultAttributes {
/**
* Result attributes on the mesh corresponding to each attribute on the curve input, in the same
* order. The data is optional only in case the attribute does not exist on the mesh for some
* reason, like "shade_smooth" when the result has no faces.
*/
Vector<std::optional<ResultAttributeData>> curve_point_attributes;
Vector<std::optional<ResultAttributeData>> curve_spline_attributes;
/**
* Result attributes corresponding the attributes on the profile input, in the same order. The
* attributes are optional in case the attribute names correspond to a names used by the curve
* input, in which case the curve input attributes take precedence.
*/
Vector<std::optional<ResultAttributeData>> profile_point_attributes;
Vector<std::optional<ResultAttributeData>> profile_spline_attributes;
/**
* Because some builtin attributes are not stored contiguously, and the curve inputs might have
* attributes with those names, it's necessary to keep OutputAttributes around to give access to
* the result data in a contiguous array.
*/
Vector<OutputAttribute> attributes;
};
static ResultAttributes create_result_attributes(const CurveEval &curve,
const CurveEval &profile,
Mesh &mesh)
{
MeshComponent mesh_component;
mesh_component.replace(&mesh, GeometryOwnershipType::Editable);
Set<AttributeIDRef> curve_attributes;
/* In order to prefer attributes on the main curve input when there are name collisions, first
* check the attributes on the curve, then add attributes on the profile that are not also on the
* main curve input. */
ResultAttributes result;
curve.splines().first()->attributes.foreach_attribute(
[&](const AttributeIDRef &id, const AttributeMetaData &meta_data) {
curve_attributes.add_new(id);
result.curve_point_attributes.append(
create_attribute_and_get_span(mesh_component, id, meta_data, result.attributes));
return true;
},
ATTR_DOMAIN_POINT);
curve.attributes.foreach_attribute(
[&](const AttributeIDRef &id, const AttributeMetaData &meta_data) {
curve_attributes.add_new(id);
result.curve_spline_attributes.append(
create_attribute_and_get_span(mesh_component, id, meta_data, result.attributes));
return true;
},
ATTR_DOMAIN_CURVE);
profile.splines().first()->attributes.foreach_attribute(
[&](const AttributeIDRef &id, const AttributeMetaData &meta_data) {
if (curve_attributes.contains(id)) {
result.profile_point_attributes.append({});
}
else {
result.profile_point_attributes.append(
create_attribute_and_get_span(mesh_component, id, meta_data, result.attributes));
}
return true;
},
ATTR_DOMAIN_POINT);
profile.attributes.foreach_attribute(
[&](const AttributeIDRef &id, const AttributeMetaData &meta_data) {
if (curve_attributes.contains(id)) {
result.profile_spline_attributes.append({});
}
else {
result.profile_spline_attributes.append(
create_attribute_and_get_span(mesh_component, id, meta_data, result.attributes));
}
return true;
},
ATTR_DOMAIN_CURVE);
return result;
}
template<typename T>
static void copy_curve_point_data_to_mesh_verts(const Span<T> src,
const ResultInfo &info,
MutableSpan<T> dst)
{
for (const int i_ring : IndexRange(info.spline_vert_len)) {
const int ring_vert_start = info.vert_offset + i_ring * info.profile_vert_len;
dst.slice(ring_vert_start, info.profile_vert_len).fill(src[i_ring]);
}
}
template<typename T>
static void copy_curve_point_data_to_mesh_edges(const Span<T> src,
const ResultInfo &info,
MutableSpan<T> dst)
{
const int edges_start = info.edge_offset + info.profile_vert_len * info.spline_edge_len;
for (const int i_ring : IndexRange(info.spline_vert_len)) {
const int ring_edge_start = edges_start + info.profile_edge_len * i_ring;
dst.slice(ring_edge_start, info.profile_edge_len).fill(src[i_ring]);
}
}
template<typename T>
static void copy_curve_point_data_to_mesh_faces(const Span<T> src,
const ResultInfo &info,
MutableSpan<T> dst)
{
for (const int i_ring : IndexRange(info.spline_edge_len)) {
const int ring_face_start = info.poly_offset + info.profile_edge_len * i_ring;
dst.slice(ring_face_start, info.profile_edge_len).fill(src[i_ring]);
}
}
static void copy_curve_point_attribute_to_mesh(const GSpan src,
const ResultInfo &info,
ResultAttributeData &dst)
{
GVArrayPtr interpolated_gvarray = info.spline.interpolate_to_evaluated(src);
GSpan interpolated = interpolated_gvarray->get_internal_span();
attribute_math::convert_to_static_type(src.type(), [&](auto dummy) {
using T = decltype(dummy);
switch (dst.domain) {
case ATTR_DOMAIN_POINT:
copy_curve_point_data_to_mesh_verts(interpolated.typed<T>(), info, dst.data.typed<T>());
break;
case ATTR_DOMAIN_EDGE:
copy_curve_point_data_to_mesh_edges(interpolated.typed<T>(), info, dst.data.typed<T>());
break;
case ATTR_DOMAIN_FACE:
copy_curve_point_data_to_mesh_faces(interpolated.typed<T>(), info, dst.data.typed<T>());
break;
case ATTR_DOMAIN_CORNER:
/* Unsupported for now, since there are no builtin attributes to convert into. */
break;
default:
BLI_assert_unreachable();
break;
}
});
}
template<typename T>
static void copy_profile_point_data_to_mesh_verts(const Span<T> src,
const ResultInfo &info,
MutableSpan<T> dst)
{
for (const int i_ring : IndexRange(info.spline_vert_len)) {
const int profile_vert_start = info.vert_offset + i_ring * info.profile_vert_len;
for (const int i_profile : IndexRange(info.profile_vert_len)) {
dst[profile_vert_start + i_profile] = src[i_profile];
}
}
}
template<typename T>
static void copy_profile_point_data_to_mesh_edges(const Span<T> src,
const ResultInfo &info,
MutableSpan<T> dst)
{
for (const int i_profile : IndexRange(info.profile_vert_len)) {
const int profile_edge_offset = info.edge_offset + i_profile * info.spline_edge_len;
dst.slice(profile_edge_offset, info.spline_edge_len).fill(src[i_profile]);
}
}
template<typename T>
static void copy_profile_point_data_to_mesh_faces(const Span<T> src,
const ResultInfo &info,
MutableSpan<T> dst)
{
for (const int i_ring : IndexRange(info.spline_edge_len)) {
const int profile_face_start = info.poly_offset + i_ring * info.profile_edge_len;
for (const int i_profile : IndexRange(info.profile_edge_len)) {
dst[profile_face_start + i_profile] = src[i_profile];
}
}
}
static void copy_profile_point_attribute_to_mesh(const GSpan src,
const ResultInfo &info,
ResultAttributeData &dst)
{
GVArrayPtr interpolated_gvarray = info.profile.interpolate_to_evaluated(src);
GSpan interpolated = interpolated_gvarray->get_internal_span();
attribute_math::convert_to_static_type(src.type(), [&](auto dummy) {
using T = decltype(dummy);
switch (dst.domain) {
case ATTR_DOMAIN_POINT:
copy_profile_point_data_to_mesh_verts(interpolated.typed<T>(), info, dst.data.typed<T>());
break;
case ATTR_DOMAIN_EDGE:
copy_profile_point_data_to_mesh_edges(interpolated.typed<T>(), info, dst.data.typed<T>());
break;
case ATTR_DOMAIN_FACE:
copy_profile_point_data_to_mesh_faces(interpolated.typed<T>(), info, dst.data.typed<T>());
break;
case ATTR_DOMAIN_CORNER:
/* Unsupported for now, since there are no builtin attributes to convert into. */
break;
default:
BLI_assert_unreachable();
break;
}
});
}
static void copy_point_domain_attributes_to_mesh(const ResultInfo &info,
ResultAttributes &attributes)
{
if (!attributes.curve_point_attributes.is_empty()) {
int i = 0;
info.spline.attributes.foreach_attribute(
[&](const AttributeIDRef &id, const AttributeMetaData &UNUSED(meta_data)) {
if (attributes.curve_point_attributes[i]) {
copy_curve_point_attribute_to_mesh(*info.spline.attributes.get_for_read(id),
info,
*attributes.curve_point_attributes[i]);
}
i++;
return true;
},
ATTR_DOMAIN_POINT);
}
if (!attributes.profile_point_attributes.is_empty()) {
int i = 0;
info.profile.attributes.foreach_attribute(
[&](const AttributeIDRef &id, const AttributeMetaData &UNUSED(meta_data)) {
if (attributes.profile_point_attributes[i]) {
copy_profile_point_attribute_to_mesh(*info.profile.attributes.get_for_read(id),
info,
*attributes.profile_point_attributes[i]);
}
i++;
return true;
},
ATTR_DOMAIN_POINT);
}
}
template<typename T>
static void copy_spline_data_to_mesh(Span<T> src, Span<int> offsets, MutableSpan<T> dst)
{
for (const int i : IndexRange(src.size())) {
dst.slice(offsets[i], offsets[i + 1] - offsets[i]).fill(src[i]);
}
}
/**
* Since the offsets for each combination of curve and profile spline are stored for every mesh
* domain, and this just needs to fill the chunks corresponding to each combination, we can use
* the same function for all mesh domains.
*/
static void copy_spline_attribute_to_mesh(const GSpan src,
const ResultOffsets &offsets,
ResultAttributeData &dst_attribute)
{
attribute_math::convert_to_static_type(src.type(), [&](auto dummy) {
using T = decltype(dummy);
switch (dst_attribute.domain) {
case ATTR_DOMAIN_POINT:
copy_spline_data_to_mesh(src.typed<T>(), offsets.vert, dst_attribute.data.typed<T>());
break;
case ATTR_DOMAIN_EDGE:
copy_spline_data_to_mesh(src.typed<T>(), offsets.edge, dst_attribute.data.typed<T>());
break;
case ATTR_DOMAIN_FACE:
copy_spline_data_to_mesh(src.typed<T>(), offsets.poly, dst_attribute.data.typed<T>());
break;
case ATTR_DOMAIN_CORNER:
copy_spline_data_to_mesh(src.typed<T>(), offsets.loop, dst_attribute.data.typed<T>());
break;
default:
BLI_assert_unreachable();
break;
}
});
}
static void copy_spline_domain_attributes_to_mesh(const CurveEval &curve,
const CurveEval &profile,
const ResultOffsets &offsets,
ResultAttributes &attributes)
{
if (!attributes.curve_spline_attributes.is_empty()) {
int i = 0;
curve.attributes.foreach_attribute(
[&](const AttributeIDRef &id, const AttributeMetaData &UNUSED(meta_data)) {
if (attributes.curve_spline_attributes[i]) {
copy_spline_attribute_to_mesh(*curve.attributes.get_for_read(id),
offsets,
*attributes.curve_spline_attributes[i]);
}
i++;
return true;
},
ATTR_DOMAIN_CURVE);
}
if (!attributes.profile_spline_attributes.is_empty()) {
int i = 0;
profile.attributes.foreach_attribute(
[&](const AttributeIDRef &id, const AttributeMetaData &UNUSED(meta_data)) {
if (attributes.profile_spline_attributes[i]) {
copy_spline_attribute_to_mesh(*profile.attributes.get_for_read(id),
offsets,
*attributes.profile_spline_attributes[i]);
}
i++;
return true;
},
ATTR_DOMAIN_CURVE);
}
}
/**
* \note Normal calculation is by far the slowest part of calculations relating to the result mesh.
* Although it would be a sensible decision to use the better topology information available while
* generating the mesh to also generate the normals, that work may wasted if the output mesh is
* changed anyway in a way that affects the normals. So currently this code uses the safer /
* simpler solution of deferring normal calculation to the rest of Blender.
*/
static Mesh *curve_to_mesh_calculate(const CurveEval &curve, const CurveEval &profile)
{
Span<SplinePtr> profiles = profile.splines();
Span<SplinePtr> curves = curve.splines();
const ResultOffsets offsets = calculate_result_offsets(profiles, curves);
if (offsets.vert.last() == 0) {
return nullptr;
}
Mesh *mesh = BKE_mesh_new_nomain(
offsets.vert.last(), offsets.edge.last(), 0, offsets.loop.last(), offsets.poly.last());
BKE_id_material_eval_ensure_default_slot(&mesh->id);
mesh->flag |= ME_AUTOSMOOTH;
mesh->smoothresh = DEG2RADF(180.0f);
BKE_mesh_normals_tag_dirty(mesh);
ResultAttributes attributes = create_result_attributes(curve, profile, *mesh);
threading::parallel_for(curves.index_range(), 128, [&](IndexRange curves_range) {
for (const int i_spline : curves_range) {
const Spline &spline = *curves[i_spline];
if (spline.evaluated_points_size() == 0) {
continue;
}
const int spline_start_index = i_spline * profiles.size();
threading::parallel_for(profiles.index_range(), 128, [&](IndexRange profiles_range) {
for (const int i_profile : profiles_range) {
const Spline &profile = *profiles[i_profile];
const int i_mesh = spline_start_index + i_profile;
ResultInfo info{
spline,
profile,
offsets.vert[i_mesh],
offsets.edge[i_mesh],
offsets.loop[i_mesh],
offsets.poly[i_mesh],
spline.evaluated_points_size(),
spline.evaluated_edges_size(),
profile.evaluated_points_size(),
profile.evaluated_edges_size(),
};
spline_extrude_to_mesh_data(info,
{mesh->mvert, mesh->totvert},
{mesh->medge, mesh->totedge},
{mesh->mloop, mesh->totloop},
{mesh->mpoly, mesh->totpoly});
copy_point_domain_attributes_to_mesh(info, attributes);
}
});
}
});
copy_spline_domain_attributes_to_mesh(curve, profile, offsets, attributes);
for (OutputAttribute &output_attribute : attributes.attributes) {
output_attribute.save();
}
return mesh;
}
static CurveEval get_curve_single_vert()
{
CurveEval curve;
std::unique_ptr<PolySpline> spline = std::make_unique<PolySpline>();
spline->add_point(float3(0), 0, 0.0f);
curve.add_spline(std::move(spline));
return curve;
}
static void geo_node_curve_to_mesh_exec(GeoNodeExecParams params) static void geo_node_curve_to_mesh_exec(GeoNodeExecParams params)
{ {
GeometrySet curve_set = params.extract_input<GeometrySet>("Curve"); GeometrySet curve_set = params.extract_input<GeometrySet>("Curve");
GeometrySet profile_set = params.extract_input<GeometrySet>("Profile Curve"); GeometrySet profile_set = params.extract_input<GeometrySet>("Profile Curve");
curve_set = bke::geometry_set_realize_instances(curve_set); curve_set = bke::geometry_set_realize_instances(curve_set);
profile_set = bke::geometry_set_realize_instances(profile_set); profile_set = bke::geometry_set_realize_instances(profile_set);
Show All 9 Lines if (curve_set.has_mesh()) {
TIP_("No curve data available in curve input")); TIP_("No curve data available in curve input"));
} }
params.set_output("Mesh", GeometrySet()); params.set_output("Mesh", GeometrySet());
return; return;
} }
const CurveEval *profile_curve = profile_set.get_curve_for_read(); const CurveEval *profile_curve = profile_set.get_curve_for_read();
static const CurveEval vert_curve = get_curve_single_vert(); if (profile_curve == nullptr) {
Mesh *mesh = geometry::curve_to_wire_mesh(*curve_set.get_curve_for_read());
Mesh *mesh = curve_to_mesh_calculate(*curve_set.get_curve_for_read(),
(profile_curve == nullptr) ? vert_curve : *profile_curve);
params.set_output("Mesh", GeometrySet::create_with_mesh(mesh)); params.set_output("Mesh", GeometrySet::create_with_mesh(mesh));
} }
else {
Mesh *mesh = geometry::curve_to_mesh_sweep(*curve_set.get_curve_for_read(), *profile_curve);
params.set_output("Mesh", GeometrySet::create_with_mesh(mesh));
}
}
} // namespace blender::nodes } // namespace blender::nodes
void register_node_type_geo_curve_to_mesh() void register_node_type_geo_curve_to_mesh()
{ {
static bNodeType ntype; static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_CURVE_TO_MESH, "Curve to Mesh", NODE_CLASS_GEOMETRY, 0); geo_node_type_base(&ntype, GEO_NODE_CURVE_TO_MESH, "Curve to Mesh", NODE_CLASS_GEOMETRY, 0);
ntype.declare = blender::nodes::geo_node_curve_to_mesh_declare; ntype.declare = blender::nodes::geo_node_curve_to_mesh_declare;
ntype.geometry_node_execute = blender::nodes::geo_node_curve_to_mesh_exec; ntype.geometry_node_execute = blender::nodes::geo_node_curve_to_mesh_exec;
nodeRegisterType(&ntype); nodeRegisterType(&ntype);
} }