R3Mesh* Terrain::Patch(R3Point center, R2Point size, R2Point dps) { // dps: dots per side
R3Mesh *patch = new R3Mesh();
for (unsigned int r = 0; r < dps.Y(); r++) {
for (unsigned int c = 0; c < dps.X(); c++) {
double dx = (double)c / dps.X() * size.X() - size.X() / 2;
double dy = (r + c) % 2 * Util::UnitRandom(); // default
if (params.heightMap) {
int x = ((double)c / dps.X()) * params.heightMap->Width();
int y = ((double)r / dps.Y()) * params.heightMap->Height();
dy = 25 * params.heightMap->Pixel(x,y).Luminance();
}
double dz = (double)r / dps.Y() * size.Y() - size.Y() / 2;
R3Point position(center.X() + dx, center.Y() + dy, center.Z() + dz);
double tx = position.X() / 80;
double ty = position.Z() / 80;
//R2Point texcoord = R2Point(tx - ((int) tx), ty - ((int) ty));
//if (texcoord.X() < 0)
//texcoord.SetX(1 + texcoord.X());
//if (texcoord.Y() < 0)
//texcoord.SetY(1 + texcoord.Y());
patch->CreateVertex(position, R3Vector(0,1,0), R2Point(tx, ty)); // id's go up along x axis, then along y
}
}
for (unsigned int r = 0; r < dps.Y() - 1; r++) {
for (unsigned int c = 0; c < dps.X() - 1; c++) {
unsigned int cols = (unsigned int)dps.X();
unsigned int k = c + r * cols;
vector<R3MeshVertex*> vertices;
vertices.push_back(patch->Vertex(k+cols));
vertices.push_back(patch->Vertex(k+1));
vertices.push_back(patch->Vertex(k));
patch->CreateFace(vertices);
vector<R3MeshVertex*> vertices2;
vertices2.push_back(patch->Vertex(k+cols));
vertices2.push_back(patch->Vertex(k+1+cols));
vertices2.push_back(patch->Vertex(k+1));
patch->CreateFace(vertices2);
}
}
patch->Update();
return patch;
}
