static void TranslateVertices(
VertexPositionColor[] vertices,
byte[] vertexByteArray,
int vertexStride,
Vector3 colorAsVector,
int vertexNumber)
{
var vertexPositionX = BitConverter.ToSingle(vertexByteArray, vertexNumber * vertexStride + 0);
var vertexPositionY = BitConverter.ToSingle(vertexByteArray, vertexNumber * vertexStride + 4);
var vertexPositionZ = BitConverter.ToSingle(vertexByteArray, vertexNumber * vertexStride + 8);
var vertexPositionColor =
new VertexPositionColor(new Vector3(vertexPositionX, vertexPositionY, vertexPositionZ), color);
vertices[vertexNumber] = vertexPositionColor;
}
void CalculateVertices(SpatialSurfaceMesh mesh,
out VertexPositionColor[] vertices,
out ushort[] indices,
out Matrix4x4 finalMatrix)
{
var transformMatrix = Matrix4x4.Identity;
var tryTransform = mesh.CoordinateSystem.TryGetTransformTo(CoordinateSystem);
if (tryTransform != null)
{
transformMatrix = tryTransform.Value;
}
var vertexByteArray = mesh.VertexPositions.Data.ToArray();
var vertexStride = (int)mesh.VertexPositions.Stride;
var vertexCount = mesh.VertexPositions.ElementCount;
var triangleIndexByteArray = mesh.TriangleIndices.Data.ToArray();
var triangleCount = mesh.TriangleIndices.ElementCount;
var vertexScale = mesh.VertexPositionScale;
var scaleMatrix = Matrix4x4.CreateScale(vertexScale);
finalMatrix = Matrix4x4.Transpose(scaleMatrix * transformMatrix);
vertices = new VertexPositionColor[vertexCount];
for (var i = 0; i < vertexCount; i++)
{
TranslateVertices(vertices, vertexByteArray, vertexStride, color, i);
}
indices = new ushort[triangleCount];
var indexOffset = 0;
for (var i = 0; i < triangleCount; i++)
{
var index = BitConverter.ToUInt16(triangleIndexByteArray, indexOffset);
indexOffset += 2;
indices[i] = index;
}
}
