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Differential D3851 Diff 12287 intern/mantaflow/intern/manta_fluid_API.cpp

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intern/mantaflow/intern/manta_fluid_API.cpp

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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2016 Blender Foundation.
* All rights reserved.
*
* Contributor(s): Sebastian Barschkis (sebbas)
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file mantaflow/intern/manta_smoke_API.cpp
* \ingroup mantaflow
*/
#include <cmath>
#include "FLUID.h"
#include "manta_fluid_API.h"
/* Fluid functions */
extern "C" FLUID *fluid_init(int *res, struct SmokeModifierData *smd) { return new FLUID(res, smd); }
extern "C" void fluid_free(FLUID *fluid) { delete fluid; fluid = NULL; }
mont29Unsubmitted
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Are all those extern "C" declarations really needed? I thought since their declarations in header are enclosed inside an extern "C" {} bloc, that was enough?

mont29: Are all those `extern "C"` declarations really needed? I thought since their declarations in…
extern "C" void fluid_ensure_obstacle(FLUID *fluid, struct SmokeModifierData *smd)
{
if (fluid) {
fluid->initObstacle(smd);
fluid->updatePointers();
}
sergeyUnsubmitted
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C++11, nullptr, *wink* *wink* ;)

sergey: C++11, `nullptr`, *wink* *wink* ;)
}
extern "C" void fluid_ensure_guiding(FLUID *fluid, struct SmokeModifierData *smd)
{
if (fluid) {
fluid->initGuiding(smd);
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use early output, and uninedent the actual code.

sergey: use early output, and uninedent the actual code.
fluid->updatePointers();
}
}
extern "C" void fluid_ensure_invelocity(FLUID *fluid, struct SmokeModifierData *smd)
{
if (fluid) {
fluid->initInVelocity(smd);
fluid->updatePointers();
}
}
extern "C" int fluid_write_data(FLUID* fluid, SmokeModifierData *smd, int framenr)
{
if (!fluid || !smd) return 0;
return fluid->writeData(smd, framenr);
}
extern "C" int fluid_read_data(FLUID* fluid, SmokeModifierData *smd, int framenr)
{
if (!fluid || !smd) return 0;
return fluid->readData(smd, framenr);
}
extern "C" int fluid_read_noise(FLUID* fluid, SmokeModifierData *smd, int framenr)
{
if (!fluid || !smd) return 0;
return fluid->readNoise(smd, framenr);
}
extern "C" int fluid_read_mesh(FLUID* fluid, SmokeModifierData *smd, int framenr)
{
if (!fluid || !smd) return 0;
return fluid->readMesh(smd, framenr);
}
extern "C" int fluid_read_particles(FLUID* fluid, SmokeModifierData *smd, int framenr)
{
if (!fluid || !smd) return 0;
return fluid->readParticles(smd, framenr);
}
extern "C" int fluid_read_guiding(FLUID* fluid, SmokeModifierData *smd, int framenr, bool sourceDomain)
{
if (!fluid || !smd) return 0;
return fluid->readGuiding(smd, framenr, sourceDomain);
}
extern "C" int fluid_update_liquid_structures(FLUID* fluid, SmokeModifierData *smd, int framenr)
{
if (!fluid || !smd) return 0;
return fluid->updateFlipStructures(smd, framenr);
}
extern "C" int fluid_update_mesh_structures(FLUID* fluid, SmokeModifierData *smd, int framenr)
{
if (!fluid || !smd) return 0;
return fluid->updateMeshStructures(smd, framenr);
}
extern "C" int fluid_update_particle_structures(FLUID* fluid, SmokeModifierData *smd, int framenr)
{
if (!fluid || !smd) return 0;
return fluid->updateParticleStructures(smd, framenr);
}
extern "C" int fluid_bake_data(FLUID* fluid, SmokeModifierData *smd, int framenr)
{
if (!fluid || !smd) return 0;
return fluid->bakeData(smd, framenr);
}
extern "C" int fluid_bake_noise(FLUID* fluid, SmokeModifierData *smd, int framenr)
{
if (!fluid || !smd) return 0;
return fluid->bakeNoise(smd, framenr);
}
extern "C" int fluid_bake_mesh(FLUID* fluid, SmokeModifierData *smd, int framenr)
{
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Broken indentation.

sergey: Broken indentation.
if (!fluid || !smd) return 0;
return fluid->bakeMesh(smd, framenr);
}
extern "C" int fluid_bake_particles(FLUID* fluid, SmokeModifierData *smd, int framenr)
{
if (!fluid || !smd) return 0;
return fluid->bakeParticles(smd, framenr);
}
extern "C" int fluid_bake_guiding(FLUID* fluid, SmokeModifierData *smd, int framenr)
{
if (!fluid || !smd) return 0;
return fluid->bakeGuiding(smd, framenr);
}
extern "C" void fluid_update_variables(FLUID* fluid, SmokeModifierData *smd)
{
if (fluid)
fluid->updateVariables(smd);
}
extern "C" int fluid_get_frame(FLUID* fluid)
{
if (!fluid) return 0;
return fluid->getFrame();
}
extern "C" float fluid_get_timestep(FLUID* fluid)
{
if (!fluid) return 0;
return fluid->getTimestep();
}
extern "C" void fluid_adapt_timestep(FLUID* fluid)
{
if (fluid)
fluid->adaptTimestep();
}
/* Fluid accessors */
extern "C" size_t fluid_get_index(int x, int max_x, int y, int max_y, int z /*, int max_z */)
{
return x + y * max_x + z * max_x*max_y;
}
extern "C" size_t fluid_get_index2d(int x, int max_x, int y /*, int max_y, int z, int max_z */)
{
return x + y * max_x;
}
extern "C" float *fluid_get_velocity_x(FLUID *fluid) { return fluid->getVelocityX(); }
extern "C" float *fluid_get_velocity_y(FLUID *fluid) { return fluid->getVelocityY(); }
extern "C" float *fluid_get_velocity_z(FLUID *fluid) { return fluid->getVelocityZ(); }
extern "C" float *fluid_get_ob_velocity_x(FLUID *fluid) { return fluid->getObVelocityX(); }
extern "C" float *fluid_get_ob_velocity_y(FLUID *fluid) { return fluid->getObVelocityY(); }
extern "C" float *fluid_get_ob_velocity_z(FLUID *fluid) { return fluid->getObVelocityZ(); }
extern "C" float *fluid_get_guide_velocity_x(FLUID *fluid) { return fluid->getGuideVelocityX(); }
extern "C" float *fluid_get_guide_velocity_y(FLUID *fluid) { return fluid->getGuideVelocityY(); }
extern "C" float *fluid_get_guide_velocity_z(FLUID *fluid) { return fluid->getGuideVelocityZ(); }
extern "C" float *fluid_get_in_velocity_x(FLUID *fluid) { return fluid->getInVelocityX(); }
extern "C" float *fluid_get_in_velocity_y(FLUID *fluid) { return fluid->getInVelocityY(); }
extern "C" float *fluid_get_in_velocity_z(FLUID *fluid) { return fluid->getInVelocityZ(); }
extern "C" float *fluid_get_force_x(FLUID *fluid) { return fluid->getForceX(); }
extern "C" float *fluid_get_force_y(FLUID *fluid) { return fluid->getForceY(); }
extern "C" float *fluid_get_force_z(FLUID *fluid) { return fluid->getForceZ(); }
extern "C" float *fluid_get_phiguidein(FLUID *fluid) { return fluid->getPhiGuideIn(); }
extern "C" int *fluid_get_num_obstacle(FLUID *fluid) { return fluid->getNumObstacle(); }
extern "C" int *fluid_get_num_guide(FLUID *fluid) { return fluid->getNumGuide(); }
extern "C" int fluid_get_res_x(FLUID* fluid) { return fluid->getResX(); }
extern "C" int fluid_get_res_y(FLUID* fluid) { return fluid->getResY(); }
extern "C" int fluid_get_res_z(FLUID* fluid) { return fluid->getResZ(); }
/* Smoke functions */
extern "C" void smoke_manta_export(FLUID* smoke, SmokeModifierData *smd)
{
if (!smoke || !smd) return;
smoke->exportSmokeScript(smd);
}
static void data_dissolve(float *density, float *heat, float *r, float *g, float *b, int total_cells, int speed, int log)
{
if (log) {
/* max density/speed = dydx */
float fac = 1.0f - (1.0f / (float)speed);
for(size_t i = 0; i < total_cells; i++)
{
/* density */
density[i] *= fac;
/* heat */
if (heat) {
heat[i] *= fac;
}
/* color */
if (r) {
r[i] *= fac;
g[i] *= fac;
b[i] *= fac;
}
}
}
else // linear falloff
{
/* max density/speed = dydx */
float dydx = 1.0f / (float)speed;
for(size_t i = 0; i < total_cells; i++)
{
float d = density[i];
/* density */
density[i] -= dydx;
if (density[i] < 0.0f)
density[i] = 0.0f;
/* heat */
if (heat) {
if (fabs(heat[i]) < dydx) heat[i] = 0.0f;
else if (heat[i] > 0.0f) heat[i] -= dydx;
else if (heat[i] < 0.0f) heat[i] += dydx;
}
/* color */
if (r && d) {
r[i] *= (density[i]/d);
g[i] *= (density[i]/d);
b[i] *= (density[i]/d);
}
}
}
}
extern "C" void smoke_dissolve(FLUID *smoke, int speed, int log)
{
data_dissolve(smoke->getDensity(), smoke->getHeat(), smoke->getColorR(), smoke->getColorG(), smoke->getColorB(), smoke->getTotalCells(), speed, log);
}
extern "C" void smoke_dissolve_wavelet(FLUID *smoke, int speed, int log)
{
data_dissolve(smoke->getDensityHigh(), 0, smoke->getColorRHigh(), smoke->getColorGHigh(), smoke->getColorBHigh(), smoke->getTotalCellsHigh(), speed, log);
}
extern "C" void smoke_export(FLUID *smoke, float *dt, float *dx, float **dens, float **react, float **flame, float **fuel, float **heat,
float **vx, float **vy, float **vz, float **r, float **g, float **b, int **obstacle, float **shadow)
{
if (dens)
*dens = smoke->getDensity();
if (fuel)
*fuel = smoke->getFuel();
if (react)
*react = smoke->getReact();
if (flame)
*flame = smoke->getFlame();
if (heat)
*heat = smoke->getHeat();
*vx = smoke->getVelocityX();
*vy = smoke->getVelocityY();
*vz = smoke->getVelocityZ();
if (r)
*r = smoke->getColorR();
if (g)
*g = smoke->getColorG();
if (b)
*b = smoke->getColorB();
*obstacle = smoke->getObstacle();
*shadow = smoke->getShadow();
*dt = 1; //dummy value, not needed for smoke
*dx = 1; //dummy value, not needed for smoke
}
extern "C" void smoke_turbulence_export(FLUID *smoke, float **dens, float **react, float **flame, float **fuel,
float **r, float **g, float **b , float **tcu, float **tcv, float **tcw, float **tcu2, float **tcv2, float **tcw2)
{
if (!smoke && !(smoke->usingNoise()))
return;
*dens = smoke->getDensityHigh();
if (fuel)
*fuel = smoke->getFuelHigh();
if (react)
*react = smoke->getReactHigh();
if (flame)
*flame = smoke->getFlameHigh();
if (r)
*r = smoke->getColorRHigh();
if (g)
*g = smoke->getColorGHigh();
if (b)
*b = smoke->getColorBHigh();
*tcu = smoke->getTextureU();
*tcv = smoke->getTextureV();
*tcw = smoke->getTextureW();
*tcu2 = smoke->getTextureU2();
*tcv2 = smoke->getTextureV2();
*tcw2 = smoke->getTextureW2();
}
static void get_rgba(float *r, float *g, float *b, float *a, int total_cells, float *data, int sequential)
{
int i;
int m = 4, i_g = 1, i_b = 2, i_a = 3;
/* sequential data */
if (sequential) {
m = 1;
i_g *= total_cells;
i_b *= total_cells;
i_a *= total_cells;
}
for (i=0; i<total_cells; i++) {
float alpha = a[i];
if (alpha) {
data[i*m ] = r[i];
data[i*m+i_g] = g[i];
data[i*m+i_b] = b[i];
}
else {
data[i*m ] = data[i*m+i_g] = data[i*m+i_b] = 0.0f;
}
data[i*m+i_a] = alpha;
}
}
sergeyUnsubmitted
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Indentation.

Review other cases in this file. Maybe even get covered by clang-format.

sergey: Indentation. Review other cases in this file. Maybe even get covered by clang-format.
extern "C" void smoke_get_rgba(FLUID *smoke, float *data, int sequential)
{
get_rgba(smoke->getColorR(), smoke->getColorG(), smoke->getColorB(), smoke->getDensity(), smoke->getTotalCells(), data, sequential);
}
extern "C" void smoke_turbulence_get_rgba(FLUID *smoke, float *data, int sequential)
{
get_rgba(smoke->getColorRHigh(), smoke->getColorGHigh(), smoke->getColorBHigh(), smoke->getDensityHigh(), smoke->getTotalCellsHigh(), data, sequential);
}
/* get a single color premultiplied voxel grid */
static void get_rgba_from_density(float color[3], float *a, int total_cells, float *data, int sequential)
{
int i;
int m = 4, i_g = 1, i_b = 2, i_a = 3;
/* sequential data */
if (sequential) {
m = 1;
i_g *= total_cells;
i_b *= total_cells;
i_a *= total_cells;
}
for (i=0; i<total_cells; i++) {
float alpha = a[i];
if (alpha) {
data[i*m ] = color[0] * alpha;
data[i*m+i_g] = color[1] * alpha;
data[i*m+i_b] = color[2] * alpha;
}
else {
data[i*m ] = data[i*m+i_g] = data[i*m+i_b] = 0.0f;
}
data[i*m+i_a] = alpha;
}
}
extern "C" void smoke_get_rgba_from_density(FLUID *smoke, float color[3], float *data, int sequential)
{
get_rgba_from_density(color, smoke->getDensity(), smoke->getTotalCells(), data, sequential);
}
extern "C" void smoke_turbulence_get_rgba_from_density(FLUID *smoke, float color[3], float *data, int sequential)
{
get_rgba_from_density(color, smoke->getDensityHigh(), smoke->getTotalCellsHigh(), data, sequential);
}
extern "C" void smoke_ensure_heat(FLUID *smoke, struct SmokeModifierData *smd)
{
if (smoke) {
smoke->initHeat(smd);
smoke->updatePointers();
}
}
extern "C" void smoke_ensure_fire(FLUID *smoke, struct SmokeModifierData *smd)
{
if (smoke) {
smoke->initFire(smd);
smoke->updatePointers();
}
if (smoke && smoke->usingNoise()) {
smoke->initFireHigh(smd);
smoke->updatePointersNoise();
}
}
extern "C" void smoke_ensure_colors(FLUID *smoke, struct SmokeModifierData *smd)
{
if (smoke) {
smoke->initColors(smd);
sergeyUnsubmitted
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What are those magic constants?

sergey: What are those magic constants?
smoke->updatePointers();
}
if (smoke && smoke->usingNoise()) {
smoke->initColorsHigh(smd);
smoke->updatePointersNoise();
}
}
/* Smoke accessors */
extern "C" float *smoke_get_density(FLUID *smoke) { return smoke->getDensity(); }
extern "C" float *smoke_get_fuel(FLUID *smoke) { return smoke->getFuel(); }
extern "C" float *smoke_get_react(FLUID *smoke) { return smoke->getReact(); }
extern "C" float *smoke_get_heat(FLUID *smoke) { return smoke->getHeat(); }
extern "C" float *smoke_get_flame(FLUID *smoke) { return smoke->getFlame(); }
extern "C" float *smoke_get_shadow(FLUID* fluid) { return fluid->getShadow(); }
extern "C" float *smoke_get_color_r(FLUID *smoke) { return smoke->getColorR(); }
extern "C" float *smoke_get_color_g(FLUID *smoke) { return smoke->getColorG(); }
extern "C" float *smoke_get_color_b(FLUID *smoke) { return smoke->getColorB(); }
extern "C" int *smoke_get_obstacle(FLUID *smoke) { return smoke->getObstacle(); }
extern "C" float *smoke_get_emission_in(FLUID* smoke) { return smoke->getEmissionIn(); }
extern "C" int smoke_has_heat(FLUID *smoke) { return (smoke->getHeat()) ? 1 : 0; }
extern "C" int smoke_has_fuel(FLUID *smoke) { return (smoke->getFuel()) ? 1 : 0; }
extern "C" int smoke_has_colors(FLUID *smoke) { return (smoke->getColorR() && smoke->getColorG() && smoke->getColorB()) ? 1 : 0; }
extern "C" float *smoke_turbulence_get_density(FLUID *smoke) { return (smoke && smoke->usingNoise()) ? smoke->getDensityHigh() : NULL; }
extern "C" float *smoke_turbulence_get_fuel(FLUID *smoke) { return (smoke && smoke->usingNoise()) ? smoke->getFuelHigh() : NULL; }
extern "C" float *smoke_turbulence_get_react(FLUID *smoke) { return (smoke && smoke->usingNoise()) ? smoke->getReactHigh() : NULL; }
extern "C" float *smoke_turbulence_get_color_r(FLUID *smoke) { return (smoke && smoke->usingNoise()) ? smoke->getColorRHigh() : NULL; }
extern "C" float *smoke_turbulence_get_color_g(FLUID *smoke) { return (smoke && smoke->usingNoise()) ? smoke->getColorGHigh() : NULL; }
extern "C" float *smoke_turbulence_get_color_b(FLUID *smoke) { return (smoke && smoke->usingNoise()) ? smoke->getColorBHigh() : NULL; }
extern "C" float *smoke_turbulence_get_flame(FLUID *smoke) { return (smoke && smoke->usingNoise()) ? smoke->getFlameHigh() : NULL; }
extern "C" int smoke_turbulence_has_fuel(FLUID *smoke) { return (smoke->getFuelHigh()) ? 1 : 0; }
extern "C" int smoke_turbulence_has_colors(FLUID *smoke) { return (smoke->getColorRHigh() && smoke->getColorGHigh() && smoke->getColorBHigh()) ? 1 : 0; }
extern "C" void smoke_turbulence_get_res(FLUID *smoke, int *res)
{
if (smoke && smoke->usingNoise()) {
res[0] = smoke->getResXHigh();
res[1] = smoke->getResYHigh();
res[2] = smoke->getResZHigh();
}
sergeyUnsubmitted
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Comment is a full sentence, starting with a capital and ending with a fullstop.

sergey: Comment is a full sentence, starting with a capital and ending with a fullstop.
}
extern "C" int smoke_turbulence_get_cells(FLUID *smoke)
{
int total_cells_high = smoke->getResXHigh() * smoke->getResYHigh() * smoke->getResZHigh();
return (smoke && smoke->usingNoise()) ? total_cells_high : 0;
}
/* Liquid functions */
extern "C" void liquid_manta_export(FLUID* liquid, SmokeModifierData *smd)
{
if (!liquid || !smd) return;
liquid->exportLiquidScript(smd);
}
extern "C" void liquid_ensure_sndparts(FLUID *liquid, struct SmokeModifierData *smd)
{
if (liquid) {
liquid->initLiquidSndParts(smd);
liquid->updatePointers();
}
}
/* Liquid accessors */
extern "C" int liquid_get_particle_res_x(FLUID* liquid) { return liquid->getParticleResX(); }
extern "C" int liquid_get_particle_res_y(FLUID* liquid) { return liquid->getParticleResY(); }
extern "C" int liquid_get_particle_res_z(FLUID* liquid) { return liquid->getParticleResZ(); }
extern "C" int liquid_get_mesh_res_x(FLUID* liquid) { return liquid->getMeshResX(); }
extern "C" int liquid_get_mesh_res_y(FLUID* liquid) { return liquid->getMeshResY(); }
extern "C" int liquid_get_mesh_res_z(FLUID* liquid) { return liquid->getMeshResZ(); }
extern "C" int liquid_get_particle_upres(FLUID* liquid) { return liquid->getParticleUpres(); }
extern "C" int liquid_get_mesh_upres(FLUID* liquid) { return liquid->getMeshUpres(); }
extern "C" float *liquid_get_phiin(FLUID *liquid) { return liquid->getPhiIn(); }
extern "C" float *liquid_get_phiobsin(FLUID *liquid) { return liquid->getPhiObsIn(); }
extern "C" float *liquid_get_phioutin(FLUID *liquid) { return liquid->getPhiOutIn(); }
extern "C" int liquid_get_num_verts(FLUID *liquid) { return liquid->getNumVertices(); }
extern "C" int liquid_get_num_normals(FLUID *liquid) { return liquid->getNumNormals(); }
extern "C" int liquid_get_num_triangles(FLUID *liquid) { return liquid->getNumTriangles(); }
extern "C" float liquid_get_vertex_x_at(FLUID *liquid, int i) { return liquid->getVertexXAt(i); }
extern "C" float liquid_get_vertex_y_at(FLUID *liquid, int i) { return liquid->getVertexYAt(i); }
extern "C" float liquid_get_vertex_z_at(FLUID *liquid, int i) { return liquid->getVertexZAt(i); }
extern "C" float liquid_get_normal_x_at(FLUID *liquid, int i) { return liquid->getNormalXAt(i); }
extern "C" float liquid_get_normal_y_at(FLUID *liquid, int i) { return liquid->getNormalYAt(i); }
extern "C" float liquid_get_normal_z_at(FLUID *liquid, int i) { return liquid->getNormalZAt(i); }
extern "C" int liquid_get_triangle_x_at(FLUID *liquid, int i) { return liquid->getTriangleXAt(i); }
extern "C" int liquid_get_triangle_y_at(FLUID *liquid, int i) { return liquid->getTriangleYAt(i); }
extern "C" int liquid_get_triangle_z_at(FLUID *liquid, int i) { return liquid->getTriangleZAt(i); }
extern "C" float liquid_get_vertvel_x_at(FLUID *liquid, int i) { return liquid->getVertVelXAt(i); }
extern "C" float liquid_get_vertvel_y_at(FLUID *liquid, int i) { return liquid->getVertVelYAt(i); }
extern "C" float liquid_get_vertvel_z_at(FLUID *liquid, int i) { return liquid->getVertVelZAt(i); }
extern "C" int liquid_get_num_flip_particles(FLUID *liquid) { return liquid->getNumFlipParticles(); }
extern "C" int liquid_get_num_snd_particles(FLUID *liquid) { return liquid->getNumSndParticles(); }
extern "C" int liquid_get_flip_particle_flag_at(FLUID *liquid, int i) { return liquid->getFlipParticleFlagAt(i); }
extern "C" int liquid_get_snd_particle_flag_at(FLUID *liquid, int i) { return liquid->getSndParticleFlagAt(i); }
extern "C" float liquid_get_flip_particle_position_x_at(FLUID *liquid, int i) { return liquid->getFlipParticlePositionXAt(i); }
extern "C" float liquid_get_flip_particle_position_y_at(FLUID *liquid, int i) { return liquid->getFlipParticlePositionYAt(i); }
extern "C" float liquid_get_flip_particle_position_z_at(FLUID *liquid, int i) { return liquid->getFlipParticlePositionZAt(i); }
extern "C" float liquid_get_flip_particle_velocity_x_at(FLUID *liquid, int i) { return liquid->getFlipParticleVelocityXAt(i); }
extern "C" float liquid_get_flip_particle_velocity_y_at(FLUID *liquid, int i) { return liquid->getFlipParticleVelocityYAt(i); }
extern "C" float liquid_get_flip_particle_velocity_z_at(FLUID *liquid, int i) { return liquid->getFlipParticleVelocityZAt(i); }
extern "C" float liquid_get_snd_particle_position_x_at(FLUID *liquid, int i) { return liquid->getSndParticlePositionXAt(i); }
extern "C" float liquid_get_snd_particle_position_y_at(FLUID *liquid, int i) { return liquid->getSndParticlePositionYAt(i); }
extern "C" float liquid_get_snd_particle_position_z_at(FLUID *liquid, int i) { return liquid->getSndParticlePositionZAt(i); }
extern "C" float liquid_get_snd_particle_velocity_x_at(FLUID *liquid, int i) { return liquid->getSndParticleVelocityXAt(i); }
extern "C" float liquid_get_snd_particle_velocity_y_at(FLUID *liquid, int i) { return liquid->getSndParticleVelocityYAt(i); }
extern "C" float liquid_get_snd_particle_velocity_z_at(FLUID *liquid, int i) { return liquid->getSndParticleVelocityZAt(i); }