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add Thomas Jacobsen / position based dynamics cloth constraint solver

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This commit is contained in:
erwincoumans
2013-09-06 19:50:58 -07:00
parent 8faac34801
commit 40acf922e3
5 changed files with 94 additions and 18 deletions
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26
Demos3/CpuDemos/deformable/CpuSoftBodyDemo.cpp
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@@ -15,6 +15,7 @@
#include "CpuSoftClothDemoInternalData.h"
#include "ExplicitEuler.h"
#include "PositionBasedDynamics.h"
static b3KeyboardCallback oldCallback = 0;
extern bool gReset;
@@ -22,8 +23,9 @@ extern bool gReset;
float clothWidth = 4;
float clothHeight= 4;
int width = 64;
int height = 64;
int width = 32;//64;
int height = 32;//64;
int numPoints = width*height;
float clothMass = 100.f;
@@ -114,7 +116,7 @@ struct GraphicsVertex
void CpuSoftClothDemo::renderScene()
{
//wireframe
bool wireframe=true;
bool wireframe=false;
if (wireframe)
{
m_instancingRenderer->init();
@@ -157,8 +159,18 @@ void CpuSoftClothDemo::clientMoveAndDisplay()
//write positions
int vertexStride =sizeof(GraphicsVertex);//9 * sizeof(float);
ExplicitEuler::solveConstraints(m_clothData, (char*)m_data->m_clothVertices, vertexStride, deltaTime);
int method = 1;
switch (method)
{
case 0:
ExplicitEuler::solveConstraints(m_clothData, (char*)m_data->m_clothVertices, vertexStride, deltaTime);
break;
case 1:
PositionBasedDynamics::solveConstraints(m_clothData, (char*)m_data->m_clothVertices, vertexStride, deltaTime);
break;
default:
b3Error("unknown method for CpuSoftClothDemo::solveConstraints");
};
//read positions
@@ -260,8 +272,8 @@ void CpuSoftClothDemo::setupScene(const ConstructionInfo& ci)
float posX = (x/((float)(width-1)))*(clothWidth);
float posZ = ((y-height/2.f)/((float)(height-1)))*(clothHeight);
cpu_buffer[y*width+x].pos[0] = posX;
cpu_buffer[y*width+x].pos[1] = coord;
cpu_buffer[y*width+x].pos[0] = 0;
cpu_buffer[y*width+x].pos[1] = -posX;
cpu_buffer[y*width+x].pos[2] = posZ;
cpu_buffer[y*width+x].pos[3] = 0.f;