public void Generate(VertexParametrization surfaceVertexParam)
{
float oneOverResXMinusOne = 1f / (resolutionX - 1f);
float oneOverResYMinusOne = 1f / (resolutionY - 1f);
for (int y = 0; y < resolutionY; ++y) {
float normY = y * oneOverResYMinusOne;
for (int x = 0; x < resolutionX; ++x) {
float normX = x * oneOverResXMinusOne;
Vertex vert = surfaceVertexParam(normX, normY);
if (vertices != null) {
vertices[vertexOffset] = vert.position;
}
if (normals != null) {
if (autoGenerateNormalsArray) {
normals[vertexOffset] = Vector3.Cross(
computeSurfaceYDerivative(surfaceVertexParam, normX, normY, vert.position, derivativeResolution),
computeSurfaceXDerivative(surfaceVertexParam, normX, normY, vert.position, derivativeResolution)
).normalized;
} else {
normals[vertexOffset] = vert.normal;
}
}
if (uvs != null) {
uvs[vertexOffset] = vert.uv;
}
if (colors != null) {
colors[colorOffset++] = vert.color;
}
if (indices != null && x < resolutionX - 1 && y < resolutionY - 1) {
if (makeClockwiseTriangles) {
makeTriangle(vertexOffset, vertexOffset + 1, vertexOffset + resolutionX);
makeTriangle(vertexOffset + 1, vertexOffset + resolutionX + 1, vertexOffset + resolutionX);
} else {
makeTriangle(vertexOffset + resolutionX, vertexOffset + 1, vertexOffset);
makeTriangle(vertexOffset + resolutionX, vertexOffset + resolutionX + 1, vertexOffset + 1);
}
}
++vertexOffset;
}
}
}
private static Vector3 computeSurfaceYDerivative(VertexParametrization surfaceParam, float x, float y, Vector3 surfaceParamOfxy, float h)
{
return (surfaceParam(x, y + h).position - surfaceParamOfxy) / h;
}
