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Differential D9303 Diff 30289 source/blender/editors/sculpt_paint/sculpt_cloth.c

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source/blender/editors/sculpt_paint/sculpt_cloth.c

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{ {
/* Activate the nodes inside the simulation area. */ /* Activate the nodes inside the simulation area. */
for (int n = 0; n < totnode; n++) { for (int n = 0; n < totnode; n++) {
const int node_index = POINTER_AS_INT(BLI_ghash_lookup(cloth_sim->node_state_index, nodes[n])); const int node_index = POINTER_AS_INT(BLI_ghash_lookup(cloth_sim->node_state_index, nodes[n]));
cloth_sim->node_state[node_index] = SCULPT_CLOTH_NODE_ACTIVE; cloth_sim->node_state[node_index] = SCULPT_CLOTH_NODE_ACTIVE;
} }
} }
static void sculpt_cloth_ensure_constraints_in_simulation_area(Sculpt *sd,
Object *ob,
PBVHNode **nodes,
int totnode)
{
SculptSession *ss = ob->sculpt;
Brush *brush = BKE_paint_brush(&sd->paint);
const float radius = ss->cache->initial_radius;
const float limit = radius + (radius * brush->cloth_sim_limit);
float sim_location[3];
cloth_brush_simulation_location_get(ss, brush, sim_location);
SCULPT_cloth_brush_ensure_nodes_constraints(
sd, ob, nodes, totnode, ss->cache->cloth_sim, sim_location, limit);
}
/* Main Brush Function. */ /* Main Brush Function. */
void SCULPT_do_cloth_brush(Sculpt *sd, Object *ob, PBVHNode **nodes, int totnode) void SCULPT_do_cloth_brush(Sculpt *sd, Object *ob, PBVHNode **nodes, int totnode)
{ {
SculptSession *ss = ob->sculpt; SculptSession *ss = ob->sculpt;
Brush *brush = BKE_paint_brush(&sd->paint); Brush *brush = BKE_paint_brush(&sd->paint);
/* In the first brush step of each symmetry pass, build the constraints for the vertices in all
* nodes inside the simulation's limits. */
/* Brushes that use anchored strokes and restore the mesh can't rely on symmetry passes and steps /* Brushes that use anchored strokes and restore the mesh can't rely on symmetry passes and steps
* count as it is always the first step, so the simulation needs to be created when it does not * count as it is always the first step, so the simulation needs to be created when it does not
* exist for this stroke. */ * exist for this stroke. */
if (SCULPT_stroke_is_first_brush_step_of_symmetry_pass(ss->cache) || !ss->cache->cloth_sim) { if (SCULPT_stroke_is_first_brush_step_of_symmetry_pass(ss->cache) || !ss->cache->cloth_sim) {
/* The simulation structure only needs to be created on the first symmetry pass. */ /* The simulation structure only needs to be created on the first symmetry pass. */
if (SCULPT_stroke_is_first_brush_step(ss->cache) || !ss->cache->cloth_sim) { if (SCULPT_stroke_is_first_brush_step(ss->cache) || !ss->cache->cloth_sim) {
ss->cache->cloth_sim = SCULPT_cloth_brush_simulation_create( ss->cache->cloth_sim = SCULPT_cloth_brush_simulation_create(
ss, ss,
brush->cloth_mass, brush->cloth_mass,
brush->cloth_damping, brush->cloth_damping,
brush->cloth_constraint_softbody_strength, brush->cloth_constraint_softbody_strength,
(brush->flag2 & BRUSH_CLOTH_USE_COLLISION), (brush->flag2 & BRUSH_CLOTH_USE_COLLISION),
SCULPT_is_cloth_deform_brush(brush)); SCULPT_is_cloth_deform_brush(brush));
SCULPT_cloth_brush_simulation_init(ss, ss->cache->cloth_sim); SCULPT_cloth_brush_simulation_init(ss, ss->cache->cloth_sim);
} }
if (brush->cloth_simulation_area_type == BRUSH_CLOTH_SIMULATION_AREA_LOCAL) {
/* When using simulation a fixed local simulation area, constraints are created only using
* the initial stroke position and initial radius (per symmetry pass) instead of per node.
* This allows to skip unnecessary constraints that will never be simulated, making the
sergeyUnsubmitted
Done
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Double negation. Suggestion:

This allows to skip unnecessary constraints that will never be simulated
sergey: Double negation. Suggestion: This allows to skip unnecessary constraints that will never be…
* solver faster. When the simulation starts for a node, the node gets activated and all its
* constraints are considered final. As the same node can be included inside the brush radius
* from multiple symmetry passes, the cloth brush can't activate the node for simulation yet
sergeyUnsubmitted
Done
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Can you explain why is it so?

sergey: Can you explain why is it so?
* as this will cause the ensure constraints function to skip the node in the next symmetry
* passes. It needs to build the constraints here and skip simulating the first step, so all
* passes can add their constraints to all affected nodes. */
sculpt_cloth_ensure_constraints_in_simulation_area(sd, ob, nodes, totnode);
}
/* The first step of a symmetry pass is never simulated as deformation modes need valid delta
* for brush tip alignement. */
return; return;
} }
/* Ensure the constraints for the nodes. */ /* Ensure the constraints for the nodes. */
const float radius = ss->cache->initial_radius; sculpt_cloth_ensure_constraints_in_simulation_area(sd, ob, nodes, totnode);
const float limit = radius + (radius * brush->cloth_sim_limit);
SCULPT_cloth_brush_ensure_nodes_constraints(
sd, ob, nodes, totnode, ss->cache->cloth_sim, ss->cache->location, limit);
/* Store the initial state in the simulation. */ /* Store the initial state in the simulation. */
SCULPT_cloth_brush_store_simulation_state(ss, ss->cache->cloth_sim); SCULPT_cloth_brush_store_simulation_state(ss, ss->cache->cloth_sim);
/* Enable the nodes that should be simulated. */ /* Enable the nodes that should be simulated. */
SCULPT_cloth_sim_activate_nodes(ss->cache->cloth_sim, nodes, totnode); SCULPT_cloth_sim_activate_nodes(ss->cache->cloth_sim, nodes, totnode);
/* Apply forces to the vertices. */ /* Apply forces to the vertices. */
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