Mesh* TriPatchObject::GetRenderMesh(TimeValue t, INode *inode, View& view, BOOL& needDelete) {
UpdatePatchMesh(t);
TessApprox tess = patch.GetProdTess();
if (tess.type == TESS_SET) {
needDelete = FALSE;
patch.InvalidateMesh(); // force this...
// temporarlily set the view tess to prod tess
TessApprox tempTess = patch.GetViewTess();
patch.SetViewTess(tess);
PrepareMesh(t);
patch.SetViewTess(tempTess);
return &patch.GetMesh();
} else {
Mesh *nmesh = new Mesh/*(mesh)*/;
Matrix3 otm = inode->GetObjectTM(t);
Box3 bbox;
GetDeformBBox(t, bbox);
tess.merge *= Length(bbox.Width())/1000.0f;
TessApprox disp = patch.GetDispTess();
disp.merge *= Length(bbox.Width())/1000.0f;
GetGTessFunction();
(*psGTessFunc)(&patch, BEZIER_PATCH, &otm, nmesh, &tess, &disp, &view, inode->GetMtl(), FALSE, FALSE);
if (tess.merge > 0.0f && patch.GetProdTessWeld())
WeldMesh(nmesh, tess.merge);
needDelete = TRUE;
return nmesh;
}
}
BOOL
TriObject::CanDoDisplacementMapping()
{
GetGTessFunction();
if (psGTessFunc && !mDisableDisplacement)
return TRUE;
return FALSE;
}
Mesh*
TriObject::GetRenderMesh(TimeValue t, INode *inode, View &view, BOOL& needDelete)
{
if (mDisableDisplacement || !(view.flags & RENDER_MESH_DISPLACEMENT_MAP)) {
needDelete = FALSE;
return &mesh;
}
// need to check the mesh and see if any face has a matId the requires displacment mapping
BOOL needDisp = FALSE;
// Get the material
Mtl* pMtl = inode ? inode->GetMtl() : NULL;
if (pMtl) {
// does the mesh as a whole need it
if (pMtl->Requirements(mesh.mtlIndex)&MTLREQ_DISPLACEMAP)
needDisp = TRUE;
if (!needDisp) {
for (int f = 0; f < mesh.numFaces; f++) {
if (pMtl->Requirements(mesh.getFaceMtlIndex(f))&MTLREQ_DISPLACEMAP) {
needDisp = TRUE;
break;
}
}
}
if (needDisp) {
if (mesh.getNumFaces() == 0)
return &mesh;
Matrix3 otm;
if (inode)
otm = inode->GetObjectTM(t);
else
otm.IdentityMatrix();
GetGTessFunction();
if (mSubDivideDisplacement && psGTessFunc) {
// if we have a material that does displacement mapping and if we can do it
Mesh *pMesh = new Mesh();
needDelete = TRUE;
(*psGTessFunc)((void *)&mesh, MAX_MESH, &otm, pMesh, NULL,
&mDispApprox, &view, pMtl, FALSE, mSplitMesh);
needDelete = TRUE;
return pMesh;
} else {
Mesh *pMesh = new Mesh(mesh);
needDelete = TRUE;
BOOL hasUVs = pMesh->tvFace != NULL;
pMesh->buildRenderNormals();
// now displace the verts
BitArray vertsSet;
vertsSet.SetSize(pMesh->numVerts);
for (int f = 0; f < pMesh->numFaces; f++) {
Face *pFace = &pMesh->faces[f];
TVFace *pTVFace = &pMesh->tvFace[f];
int matid = pFace->getMatID();
for (int v = 0; v < 3; v++) {
int vidx = pFace->v[v];
if (vertsSet[vidx])
continue; // displace only once
Point3 norm = pMesh->getNormal(vidx);
norm.Normalize();
Point3& vert = pMesh->getVert(vidx);
UVVert uvvert;
if (hasUVs)
uvvert = pMesh->getTVert(pTVFace->t[v]);
else {
uvvert.x = 0.0;
uvvert.y = 0.0;
}
pMesh->buildBoundingBox();
Box3 bbox = pMesh->getBoundingBox();
float dispScale = Length(bbox.pmax - bbox.pmin)/10.0f;
float disp = GetDisp(pMtl, pMesh, f, pFace->getMatID(), vert, uvvert.x, uvvert.y, otm) * dispScale;
vert += (norm * disp);
vertsSet.Set(vidx);
}
}
return pMesh;
}
}
}
needDelete = FALSE;
return &mesh;
}
