private static Mesh LoadXbfObject(XbfObject xbfObject, XbfShader shader, IReadOnlyList <int> textures)
{
var allVertices = new Dictionary <int, List <VertexPositionNormalUv> >();
var allIndices = new Dictionary <int, List <ShaderIndex> >();
foreach (var triangle in xbfObject.Triangles)
{
if (triangle.Texture == -1)
{
continue;
}
if (!allVertices.ContainsKey(triangle.Texture))
{
allVertices.Add(triangle.Texture, new List <VertexPositionNormalUv>());
allIndices.Add(triangle.Texture, new List <ShaderIndex>());
}
var vertices = allVertices[triangle.Texture];
var indices = allIndices[triangle.Texture];
for (var i = 0; i < 3; i++)
{
vertices.Add(
new VertexPositionNormalUv(
XbfMesh.Convert(xbfObject.Vertices[triangle.Vertices[i]].Position),
XbfMesh.Convert(xbfObject.Vertices[triangle.Vertices[i]].Normal),
XbfMesh.Convert(triangle.Uv[i]) * new Vector2(1, -1)
)
);
}
indices.Add(new ShaderIndex(vertices.Count - 3, vertices.Count - 2, vertices.Count - 1));
}
return(new Mesh(null, null, null)
{
Name = xbfObject.Name,
Transform = XbfMesh.Convert(xbfObject.Transform),
TransformAnimation =
xbfObject.ObjectAnimation != null && xbfObject.ObjectAnimation.Frames.Count > 0
? XbfMesh.BuildAnimation(xbfObject.ObjectAnimation)
: null,
Children = allVertices.Keys
.Select(
texture => new Mesh(
new XbfShader.XbfShaderParameters(shader)
{
Texture = textures[texture]
},
allVertices[texture].Select(vertex => vertex.Pack()).SelectMany(v => v).ToArray(),
allIndices[texture].Select(index => index.Pack()).SelectMany(i => i).ToArray()
)
)
.Concat(xbfObject.Children.Select(childXbfObject => XbfMesh.LoadXbfObject(childXbfObject, shader, textures)))
.ToArray(),
});
}
private static Matrix4[] BuildAnimation(XbfObjectAnimation xbfObjectAnimation)
{
var frames = new Matrix4[xbfObjectAnimation.Length];
var first = xbfObjectAnimation.Frames.Keys.Min();
var last = xbfObjectAnimation.Frames.Keys.Max();
var lastFrame = 0;
for (var i = 0; i < xbfObjectAnimation.Length; i++)
{
if (!xbfObjectAnimation.Frames.ContainsKey(i))
{
continue;
}
frames[i] = XbfMesh.Convert(xbfObjectAnimation.Frames[i]);
if (i == first)
{
for (var j = 0; j < i; j++)
{
frames[j] = frames[i];
}
}
else if (i > last)
{
frames[i] = frames[last];
}
else
{
for (; lastFrame + 1 < i; lastFrame++)
{
frames[lastFrame + 1] = frames[lastFrame] + (frames[i] - frames[lastFrame]) * (1f / (i - lastFrame));
}
}
lastFrame = i;
}
return(frames);
}