AColor UVtex::EvalColor(ShadeContext& sc) {
if (gbufID) sc.SetGBufferID(gbufID);
#if MAX_RELEASE > 3100
Point3 uvw;
if (uvChannel < 0)
{
if (sc.InMtlEditor())
{
Point2 a, b;
sc.ScreenUV(a, b);
uvw = Point3(a.x, a.y, 0.0f);
} else if (sc.globContext != NULL && sc.NodeID() >= 0)
{
RenderInstance* ri = sc.globContext->GetRenderInstance(sc.NodeID());
Mesh* m = ri->mesh;
if (m->mapSupport(uvChannel))
{
Point3 bc = sc.BarycentricCoords();
int i = sc.FaceNumber();
UVVert* v = m->mapVerts(uvChannel);
TVFace* f = m->mapFaces(uvChannel);
uvw = v[f[i].t[0]] * bc.x +
v[f[i].t[1]] * bc.y +
v[f[i].t[2]] * bc.z;
} else {
uvw = Point3(0.0,0.0,0.0);
}
} else {
uvw = Point3(0.0,0.0,0.0);
}
} else {
uvw = sc.UVW(uvChannel);
}
#else
Point3 uvw = sc.UVW(uvChannel);
#endif
if (clampUVW) {
uvw.x = Clamp(uvw.x);
uvw.y = Clamp(uvw.y);
uvw.z = Clamp(uvw.z);
} else {
uvw.x = mod(uvw.x, 1.0000001f);
uvw.y = mod(uvw.y, 1.0000001f);
uvw.z = mod(uvw.z, 1.0000001f);
}
return EvalUVtex(uvw);
}
// Seed random number generator
void BerconGradient::seedRandomGen(ShadeContext& sc) {
int seed = 1;
if (previewMatIDMode) {
seed = sc.mtlNum;
} else {
if (p_randMat) {
seed += sc.mtlNum;
}
if (p_randObj) {
int hand = (int)sc.Node()->GetHandle();
seed += hand*(hand*hand*15731 + 789221);
}
if (p_randPar) {
Object *ob = sc.GetEvalObject();
if (ob && ob->IsParticleSystem()) {
ParticleObject *obj = (ParticleObject*)ob;
IChkMtlAPI* chkMtlAPI = static_cast<IChkMtlAPI*>(obj->GetInterface(I_NEWMTLINTERFACE));
if ((chkMtlAPI && chkMtlAPI->SupportsParticleIDbyFace())) {
int id = chkMtlAPI->GetParticleFromFace(sc.FaceNumber());
seed += id*(id*id*571 + 789221);
}
}
}
if (p_randTile) {
seed += (int)(sc.UVW(99).z);
}
}
seed *= p_seed;
srand(seed*(seed*seed*15731 + 789221));
}