public static int generateLightCone(int stacks, int slices, out Buffer vbuf, out Buffer ibuf)
{
VF.Position3[] vertices = new VF.Position3[(1 + slices + 1) + (stacks + 1) * (slices + 1)];
ushort[] indices = new ushort[(slices + 1) * 2 + 2 + stacks * (slices + 1) * 2];
int verticesIdx = 0;
// bottom
vertices[verticesIdx++] = new VF.Position3()
{
Position = Vector3.UnitZ
};
for (int sliceNumber = 0; sliceNumber <= slices; ++sliceNumber)
{
float phi = sliceNumber * 2 * Radians.PI / slices + Radians.PI / 2;
float sinPhi = Radians.Sin(phi);
float cosPhi = Radians.Cos(phi);
vertices[verticesIdx++] = new VF.Position3()
{
Position = new Vector3(cosPhi, sinPhi, 1.0f)
};
}
// cone
for (int stackNumber = 0; stackNumber <= stacks; ++stackNumber)
{
for (int sliceNumber = slices; sliceNumber >= 0; --sliceNumber)
{
float phi = sliceNumber * 2 * Radians.PI / slices + Radians.PI / 2;
float sinPhi = Radians.Sin(phi);
float cosPhi = Radians.Cos(phi);
float t = 1.0f - (float)stackNumber / (float)stacks;
vertices[verticesIdx++] = new VF.Position3()
{
Position = new Vector3(cosPhi * t, sinPhi * t, t)
};
}
}
int indicesIdx = 0;
// bottom
for (int sliceNumber = 0; sliceNumber <= slices; ++sliceNumber)
{
indices[indicesIdx++] = (ushort)(0);
indices[indicesIdx++] = (ushort)(1 + sliceNumber);
}
indices[indicesIdx++] = (ushort)(1 + slices);
indices[indicesIdx++] = (ushort)(1 + slices);
for (int stackNumber = 0; stackNumber < stacks; ++stackNumber)
{
for (int sliceNumber = 0; sliceNumber <= slices; ++sliceNumber)
{
indices[indicesIdx++] = (ushort)((1 + slices + 1) + (stackNumber + 1) * (slices + 1) + sliceNumber);
indices[indicesIdx++] = (ushort)((1 + slices + 1) + stackNumber * (slices + 1) + sliceNumber);
}
}
vbuf = Device.Current.CreateVertexBuffer(BufferUsage.StaticDraw, vertices);
ibuf = Device.Current.CreateIndexBuffer(BufferUsage.StaticDraw, indices);
return indicesIdx;
}
public static int generateLightSphere(int stacks, int slices, out Buffer vbuf, out Buffer ibuf)
{
VF.Position3[] vertices = new VF.Position3[(stacks + 1) * (slices + 1)];
ushort[] indices = new ushort[stacks * (slices + 1) * 2];
int verticesIdx = 0;
for (int stackNumber = 0; stackNumber <= stacks; ++stackNumber)
{
for (int sliceNumber = 0; sliceNumber <= slices; ++sliceNumber)
{
float theta = stackNumber * Radians.PI / stacks;
float phi = sliceNumber * 2 * Radians.PI / slices + Radians.PI / 2;
float sinTheta = Radians.Sin(theta);
float sinPhi = Radians.Sin(phi);
float cosTheta = Radians.Cos(theta);
float cosPhi = Radians.Cos(phi);
vertices[verticesIdx++] = new VF.Position3()
{
Position = new Vector3(cosPhi * sinTheta, sinPhi * sinTheta, cosTheta)
};
}
}
int indicesIdx = 0;
for (int stackNumber = 0; stackNumber < stacks; ++stackNumber)
{
for (int sliceNumber = 0; sliceNumber <= slices; ++sliceNumber)
{
indices[indicesIdx++] = (ushort)(stackNumber * (slices + 1) + sliceNumber);
indices[indicesIdx++] = (ushort)((stackNumber + 1) * (slices + 1) + sliceNumber);
}
}
vbuf = Device.Current.CreateVertexBuffer(BufferUsage.StaticDraw, vertices);
ibuf = Device.Current.CreateIndexBuffer(BufferUsage.StaticDraw, indices);
return indicesIdx;
}
