private static void getIdentity(out BicubicBezierPatchPoint point1, out BicubicBezierPatchPoint point2, out BicubicBezierPatchPoint point3, out BicubicBezierPatchPoint point4)
{
const float size = 1;
var cpX = new Vec3(size * .6666f, 0, 0);
var cpY = new Vec3(0, size * .6666f, 0);
var pos = new Vec3(-size, -size, 0);
var surface = new Vec3(pos.x + cpX.x, pos.y + cpY.y, 0);
point1 = new BicubicBezierPatchPoint(pos, pos + cpX, pos + cpY, surface);
pos = new Vec3(-size, size, 0);
surface = new Vec3(pos.x + cpX.x, pos.y - cpY.y, 0);
point2 = new BicubicBezierPatchPoint(pos, pos - cpY, pos + cpX, surface);
pos = new Vec3(size, size, 0);
surface = new Vec3(pos.x - cpX.x, pos.y - cpY.y, 0);
point3 = new BicubicBezierPatchPoint(pos, pos - cpX, pos - cpY, surface);
pos = new Vec3(size, -size, 0);
surface = new Vec3(pos.x - cpX.x, pos.y + cpY.y, 0);
point4 = new BicubicBezierPatchPoint(pos, pos + cpY, pos - cpX, surface);
}
public BicubicBezierPatch(BicubicBezierPatchPoint point1, BicubicBezierPatchPoint point2, BicubicBezierPatchPoint point3, BicubicBezierPatchPoint point4, int density, Material material)
{
this.point1 = point1;
this.point2 = point2;
this.point3 = point3;
this.point4 = point4;
this.density = density;
this.material = material;
// create mesh
int vertexCount = density * density;
int indexCount = ((density - 1) * (density - 1)) * 6;
vertices = new Vec3[vertexCount];
normals = new Vec3[vertexCount];
uvs = new Vec2[vertexCount];
indices = new int[indexCount];
// compute mesh verts
float delta = 1.0f / density;
for (int y = 0; y != density; ++y)
{
float v = y / (float)(density - 1);
for (int x = 0; x != density; ++x)
{
float u = x / (float)(density - 1);
int i = x + (y * density);
vertices[i] = getPoint(u, v, delta, out normals[i]);
uvs[i] = new Vec2(u, v);
}
}
// comput indices
int indexOffset = 0;
for (int y = 0; y != density - 1; ++y)
{
for (int x = 0; x != density - 1; ++x)
{
int i = x + (y * density);
int ix = i + 1;
int iy = i + density;
int ixy = iy + 1;
indices[indexOffset] = i;
indices[indexOffset + 1] = iy;
indices[indexOffset + 2] = ixy;
indices[indexOffset + 3] = i;
indices[indexOffset + 4] = ixy;
indices[indexOffset + 5] = ix;
indexOffset += 6;
}
}
// set buffers
mesh = new Mesh();
mesh.MarkDynamic();
mesh.vertices = vertices.ToVector3();
mesh.uv = uvs.ToVector2();
mesh.normals = normals.ToVector3();
mesh.SetIndices(indices, MeshTopology.Triangles, 0);
}
