Accepted CreatePatchUV contribution, thanks to mi076.
See also http://code.google.com/p/game-ws
This commit is contained in:
erwin.coumans
@@ -552,6 +552,210 @@ btSoftBody* btSoftBodyHelpers::CreatePatch(btSoftBodyWorldInfo& worldInfo,const
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return(psb);
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}
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//
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btSoftBody* btSoftBodyHelpers::CreatePatchUV(btSoftBodyWorldInfo& worldInfo,
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const btVector3& corner00,
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const btVector3& corner10,
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const btVector3& corner01,
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const btVector3& corner11,
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int resx,
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int resy,
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int fixeds,
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bool gendiags,
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float* tex_coords)
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{
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/*
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*
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* corners:
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*
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* [0][0] corner00 ------- corner01 [resx][0]
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* | |
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* | |
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* [0][resy] corner10 -------- corner11 [resx][resy]
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*
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*
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*
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*
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*
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*
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* "fixedgs" map:
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*
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* corner00 --> +1
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* corner01 --> +2
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* corner10 --> +4
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* corner11 --> +8
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* upper middle --> +16
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* left middle --> +32
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* right middle --> +64
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* lower middle --> +128
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* center --> +256
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*
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*
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* tex_coords size (resx-1)*(resy-1)*12
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*
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*
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*
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* SINGLE QUAD INTERNALS
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*
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* 1) btSoftBody's nodes and links,
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* diagonal link is optional ("gendiags")
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*
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*
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* node00 ------ node01
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* | .
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* | .
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* | .
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* | .
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* | .
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* node10 node11
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*
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*
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*
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* 2) Faces:
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* two triangles,
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* UV Coordinates (hier example for single quad)
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*
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* (0,1) (0,1) (1,1)
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* 1 |\ 3 \-----| 2
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* | \ \ |
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* | \ \ |
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* | \ \ |
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* | \ \ |
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* 2 |-----\ 3 \| 1
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* (0,0) (1,0) (1,0)
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*
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*
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*
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*
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*
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*
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*/
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#define IDX(_x_,_y_) ((_y_)*rx+(_x_))
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/* Create nodes */
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if((resx<2)||(resy<2)) return(0);
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const int rx=resx;
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const int ry=resy;
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const int tot=rx*ry;
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btVector3* x=new btVector3[tot];
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btScalar* m=new btScalar[tot];
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for(int iy=0;iy<ry;++iy)
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{
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const btScalar ty=iy/(btScalar)(ry-1);
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const btVector3 py0=lerp(corner00,corner01,ty);
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const btVector3 py1=lerp(corner10,corner11,ty);
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for(int ix=0;ix<rx;++ix)
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{
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const btScalar tx=ix/(btScalar)(rx-1);
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x[IDX(ix,iy)]=lerp(py0,py1,tx);
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m[IDX(ix,iy)]=1;
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}
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}
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btSoftBody* psb=new btSoftBody(&worldInfo,tot,x,m);
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if(fixeds&1) psb->setMass(IDX(0,0),0);
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if(fixeds&2) psb->setMass(IDX(rx-1,0),0);
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if(fixeds&4) psb->setMass(IDX(0,ry-1),0);
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if(fixeds&8) psb->setMass(IDX(rx-1,ry-1),0);
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if(fixeds&16) psb->setMass(IDX((rx-1)/2,0),0);
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if(fixeds&32) psb->setMass(IDX(0,(ry-1)/2),0);
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if(fixeds&64) psb->setMass(IDX(rx-1,(ry-1)/2),0);
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if(fixeds&128) psb->setMass(IDX((rx-1)/2,ry-1),0);
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if(fixeds&256) psb->setMass(IDX((rx-1)/2,(ry-1)/2),0);
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delete[] x;
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delete[] m;
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int z = 0;
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/* Create links and faces */
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for(int iy=0;iy<ry;++iy)
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{
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for(int ix=0;ix<rx;++ix)
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{
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const bool mdx=(ix+1)<rx;
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const bool mdy=(iy+1)<ry;
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int node00=IDX(ix,iy);
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int node01=IDX(ix+1,iy);
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int node10=IDX(ix,iy+1);
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int node11=IDX(ix+1,iy+1);
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if(mdx) psb->appendLink(node00,node01);
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if(mdy) psb->appendLink(node00,node10);
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if(mdx&&mdy)
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{
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psb->appendFace(node00,node10,node11);
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if (tex_coords) {
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tex_coords[z+0]=CalculateUV(resx,resy,ix,iy,0);
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tex_coords[z+1]=CalculateUV(resx,resy,ix,iy,1);
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tex_coords[z+2]=CalculateUV(resx,resy,ix,iy,0);
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tex_coords[z+3]=CalculateUV(resx,resy,ix,iy,2);
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tex_coords[z+4]=CalculateUV(resx,resy,ix,iy,3);
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tex_coords[z+5]=CalculateUV(resx,resy,ix,iy,2);
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}
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psb->appendFace(node11,node01,node00);
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if (tex_coords) {
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tex_coords[z+6 ]=CalculateUV(resx,resy,ix,iy,3);
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tex_coords[z+7 ]=CalculateUV(resx,resy,ix,iy,2);
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tex_coords[z+8 ]=CalculateUV(resx,resy,ix,iy,3);
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tex_coords[z+9 ]=CalculateUV(resx,resy,ix,iy,1);
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tex_coords[z+10]=CalculateUV(resx,resy,ix,iy,0);
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tex_coords[z+11]=CalculateUV(resx,resy,ix,iy,1);
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}
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if (gendiags) psb->appendLink(node00,node11);
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z += 12;
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}
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}
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}
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/* Finished */
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#undef IDX
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return(psb);
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}
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float btSoftBodyHelpers::CalculateUV(int resx,int resy,int ix,int iy,int id)
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{
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/*
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*
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*
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* node00 --- node01
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* | |
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* node10 --- node11
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*
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*
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* ID map:
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*
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* node00 s --> 0
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* node00 t --> 1
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*
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* node01 s --> 3
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* node01 t --> 1
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*
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* node10 s --> 0
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* node10 t --> 2
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*
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* node11 s --> 3
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* node11 t --> 2
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*
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*
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*/
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float tc=0.0f;
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if (id == 0) {
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tc = (1.0f/((resx-1))*ix);
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}
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else if (id==1) {
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tc = (1.0f/((resy-1))*(resy-1-iy));
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}
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else if (id==2) {
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tc = (1.0f/((resy-1))*(resy-1-iy-1));
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}
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else if (id==3) {
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tc = (1.0f/((resx-1))*(ix+1));
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}
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return tc;
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}
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//
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btSoftBody* btSoftBodyHelpers::CreateEllipsoid(btSoftBodyWorldInfo& worldInfo,const btVector3& center,
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const btVector3& radius,
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