private void writeVertices <TVertexOut>(
VertexSurface <TVertexOut> surface,
Func <TVertex, TVertexOut> transform = null
)
where TVertexOut : struct, IVertexData
{
ushort vOffset;
var vertexArray = surface
.WriteVerticesDirectly(this.vertices.Length, out vOffset);
if (vOffset != 0)
{
throw new Exception("Expected vertex offset to be zero.");
}
if (transform == null)
{
this.vertices.CopyTo(vertexArray, 0);
}
else
{
for (int i = 0; i < this.vertices.Length; i++)
{
vertexArray[i] = transform(this.vertices[i]);
}
}
}
