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//-----------------------------------------------------------------------------------------------
//
// The remainder of this file shows how to use the spring network class with backward integration
// in order to implement a cloth system within a 3D game environment.
// The cloth class extends the springnetwork class in order to provide
// import/export, rendering support, and hooks into the game.
//
#include "Cloth.h"
Array<Cloth*> cloths;
Cloth::Cloth(const char *_name,int _n):SpringNetwork(_n),
color(0,0.5f,1.0f)
{
cloths.Add(this);
}
Cloth::~Cloth()
{
cloths.Remove(this);
}
//
// I/O support for serialization of our springnetwork and cloth objects.
//
int cloth_showbbox = 0; // for debug visualization shows bounding box.
float cloth_showvert = 0.025f; // size of box to put around current vert selected, 0 turns off
Cloth *ClothCreate(int w,int h,float size)
{
// simple cloth generation routine that creates a typical square cloth.
// better to use a real pipeline to generate these, this is just for testing.
int i,j;
Cloth *cloth = new Cloth("cloth",w*h);
cloth->w=w;
cloth->h=h; // later for rendering.
for(i=0;i<h;i++)
for(j=0;j<w;j++)
{
cloth->X[i*w+j] = (float3(-0.5f,-0.5f,0)+float3((float)j/(w-1.0f),1.0f-(float)i/(h-1.0f),0)) * size;
}
for(i=0;i<h;i++)
for(j=0;j<w;j++)
{
if(i<h-1) cloth->CreateSpring(SPRING_STRUCT,i*w+j,(i+1)*w+j); // structural
if(j<w-1) cloth->CreateSpring(SPRING_STRUCT,i*w+j,i*w+(j+1)); // structural
if(j<w-1&&i<h-1) cloth->CreateSpring(SPRING_SHEAR ,i*w+j,(i+1)*w+(j+1)); // shear
if(j>0 &&i<h-1) cloth->CreateSpring(SPRING_SHEAR ,i*w+j,(i+1)*w+(j-1)); // shear
if(i<h-2) cloth->CreateSpring(SPRING_BEND ,i*w+j,(i+2)*w+j); // benders
if(j<w-2) cloth->CreateSpring(SPRING_BEND ,i*w+j,i*w+(j+2)); // benders
}
cloth->UpdateLimits();
return cloth;
}
int cloth_tess = 20;
float3 cloth_spawnpoint(0,3,5.0f);
/*
static void ClothDrawSprings(Cloth *cloth)
{
static const float3 color[3]={float3(1,1,0),float3(1,0,1),float3(0,1,1)};
float3N &X = cloth->X;
for(int i=0;i<cloth->springs.count;i++)
{
SpringNetwork::Spring &s = cloth->springs[i];
extern void Line(const float3 &,const float3 &,const float3 &color_rgb);
Line(X[s.a],X[s.b],color[s.type]);
}
}
*/
int cloth_showsprings=0;
void DoCloths()
{
int i;
for(i=0;i<cloths.count;i++)
{
Cloth *cloth=cloths[i];
// cloth->Simulate((cloth->cloth_step<0)?DeltaT:cloth->cloth_step);
//if(cloth_showsprings)
// ClothDrawSprings(cloth); // debug visualization
}
}
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