private static NormalBuffers GetNormalBuffers(ModelMesh mesh, ModelMeshPart meshPart, GraphicsDevice graphicsDevice, float normalLengthPercentage)
{
if (meshPart.VertexBuffer == null)
{
return(null);
}
Vector3[] positions = VertexElementExtractor.GetVertexElement(meshPart, VertexElementUsage.Position);
if (positions == null)
{
return(null);
}
Vector3[] normals = VertexElementExtractor.GetVertexElement(meshPart, VertexElementUsage.Normal);
if (normals == null)
{
return(null);
}
NormalBuffers normalBuffers = new NormalBuffers();
normalBuffers.PrimitiveCount = normals.Length;
normalBuffers.VertexCount = normals.Length * 2;
float size = mesh.BoundingSphere.Radius * normalLengthPercentage;
VertexBuffer vertexBuffer = new VertexBuffer(graphicsDevice,
typeof(VertexPositionColor), normalBuffers.VertexCount,
BufferUsage.WriteOnly);
VertexPositionColor[] vertices = new VertexPositionColor[normalBuffers.VertexCount];
int counter = 0;
for (int i = 0; i < normals.Length; ++i)
{
Vector3 normalColorTemp = Vector3.Normalize(normals[i]);
normalColorTemp += Vector3.One;
normalColorTemp *= 0.5f;
Color normalColor = new Color(normalColorTemp);
vertices[counter++] = new VertexPositionColor(positions[i], normalColor);
vertices[counter++] = new VertexPositionColor(positions[i] + (normals[i] * size), normalColor);
}
vertexBuffer.SetData(vertices);
normalBuffers.Vertices = vertexBuffer;
IndexBuffer indexBuffer = new IndexBuffer(graphicsDevice, IndexElementSize.SixteenBits, normalBuffers.VertexCount,
BufferUsage.WriteOnly);
indexBuffer.SetData(Enumerable.Range(0, normalBuffers.VertexCount).Select(i => (short)i).ToArray());
normalBuffers.Indices = indexBuffer;
return(normalBuffers);
}
private static BoundingBox?GetBoundingBox(ModelMeshPart meshPart)
{
if (meshPart.VertexBuffer == null)
{
return(null);
}
Vector3[] positions = VertexElementExtractor.GetVertexElement(meshPart, VertexElementUsage.Position);
if (positions == null)
{
return(null);
}
return(BoundingBox.CreateFromPoints(positions));
}
protected virtual void RebuildBB()
{
if (EntityModel == null)
{
return;
}
if (verts == null)
{
verts = VertexElementExtractor.GetVertexData(EntityModel);
}
_world = Matrix.CreateScale(_scale) * Matrix.CreateWorld(_position, _forward, _up);
bounds = VertexElementExtractor.UpdateBoundingBoxFromVertexList(EntityModel, _world, verts);
}
/* Returns a new boudning box based on model mesh vertices. */
private static BoundingBox?GetMeshBoundingBox(ModelMeshPart meshPart, Matrix transform)
{
if (meshPart.VertexBuffer == null)
{
return(null);
}
Vector3[] positions = VertexElementExtractor.GetVertexElement(meshPart, VertexElementUsage.Position);
if (positions == null)
{
return(null);
}
Vector3[] transformedPositions = new Vector3[positions.Length];
Vector3.Transform(positions, ref transform, transformedPositions);
return(BoundingBox.CreateFromPoints(transformedPositions));
}