private static GC.Geometry ConvertBasicToGCGeometry(Basic.Geometry basicGeometry)
{
var geometry = new GC.Geometry();
geometry.VertexBuffers.Add(new GC.VertexPositionBuffer(basicGeometry.VertexPositions));
var positionFlags = GC.IndexAttributeFlags.HasPosition;
if (basicGeometry.VertexCount > byte.MaxValue)
{
positionFlags |= GC.IndexAttributeFlags.Position16BitIndex;
}
var indexFlagsParams = new List <GC.IndexAttributeFlagsParam>();
var normals = new List <Vector3>();
var uvs = new List <Vector2 <short> >();
var colors = new List <Color>();
foreach (var basicMesh in basicGeometry.Meshes)
{
var basicMaterial = basicGeometry.Materials[basicMesh.MaterialId];
var mesh = new GC.Mesh();
var indexFlags = positionFlags;
var useColors = false;
var hasColors = basicMesh.Colors != null;
var hasUVs = basicMesh.UVs != null;
var hasVertexNormals = basicGeometry.VertexNormals != null;
var hasNormals = hasVertexNormals || basicMesh.Normals != null;
if (hasColors || !hasNormals)
{
indexFlags |= GC.IndexAttributeFlags.HasColor;
useColors = true;
}
else
{
indexFlags |= GC.IndexAttributeFlags.HasNormal;
}
if (hasUVs)
{
indexFlags |= GC.IndexAttributeFlags.HasUV;
}
//Debug.Assert( indexFlags == ( GC.IndexAttributeFlags.HasPosition | GC.IndexAttributeFlags.HasNormal ) ||
// indexFlags == ( GC.IndexAttributeFlags.Position16BitIndex | GC.IndexAttributeFlags.HasPosition | GC.IndexAttributeFlags.Normal16BitIndex | GC.IndexAttributeFlags.HasNormal ) ||
// indexFlags == ( GC.IndexAttributeFlags.HasPosition | GC.IndexAttributeFlags.HasColor ) ||
// indexFlags == ( GC.IndexAttributeFlags.Position16BitIndex | GC.IndexAttributeFlags.HasPosition | GC.IndexAttributeFlags.Color16BitIndex | GC.IndexAttributeFlags.HasColor ) ||
// indexFlags == ( GC.IndexAttributeFlags.HasPosition | GC.IndexAttributeFlags.HasNormal | GC.IndexAttributeFlags.HasUV ) ||
// indexFlags == ( GC.IndexAttributeFlags.Position16BitIndex | GC.IndexAttributeFlags.HasPosition | GC.IndexAttributeFlags.Normal16BitIndex | GC.IndexAttributeFlags.HasNormal | GC.IndexAttributeFlags.HasUV ) ||
// indexFlags == ( GC.IndexAttributeFlags.HasPosition | GC.IndexAttributeFlags.HasColor | GC.IndexAttributeFlags.HasUV ) ||
// indexFlags == ( GC.IndexAttributeFlags.Position16BitIndex | GC.IndexAttributeFlags.HasPosition | GC.IndexAttributeFlags.Color16BitIndex | GC.IndexAttributeFlags.HasColor | GC.IndexAttributeFlags.HasUV ) ||
// indexFlags == ( GC.IndexAttributeFlags.HasPosition | GC.IndexAttributeFlags.HasNormal | GC.IndexAttributeFlags.UV16BitIndex | GC.IndexAttributeFlags.HasUV ) ||
// indexFlags == ( GC.IndexAttributeFlags.Position16BitIndex | GC.IndexAttributeFlags.HasPosition | GC.IndexAttributeFlags.Normal16BitIndex | GC.IndexAttributeFlags.HasNormal | GC.IndexAttributeFlags.UV16BitIndex | GC.IndexAttributeFlags.HasUV ) ||
// indexFlags == ( GC.IndexAttributeFlags.HasPosition | GC.IndexAttributeFlags.HasColor | GC.IndexAttributeFlags.UV16BitIndex | GC.IndexAttributeFlags.HasUV ) ||
// indexFlags == ( GC.IndexAttributeFlags.Position16BitIndex | GC.IndexAttributeFlags.HasPosition | GC.IndexAttributeFlags.Color16BitIndex | GC.IndexAttributeFlags.HasColor | GC.IndexAttributeFlags.UV16BitIndex | GC.IndexAttributeFlags.HasUV ) );
// Set up parameters
var indexFlagsParam = new GC.IndexAttributeFlagsParam(indexFlags);
mesh.Parameters.Add(indexFlagsParam);
indexFlagsParams.Add(indexFlagsParam);
if (useColors)
{
mesh.Parameters.Add(new GC.LightingParams(GC.LightingParams.Preset.Colors));
}
else
{
mesh.Parameters.Add(new GC.LightingParams(GC.LightingParams.Preset.Normals));
}
mesh.Parameters.Add(new GC.TextureParams(( ushort )(basicMaterial.TextureId)));
mesh.Parameters.Add(new GC.MipMapParams());
// Build display list
var basicTriangles = basicMesh.ToTriangles();
for (int i = 0; i < basicTriangles.Length; i += 3)
{
var temp = basicTriangles[i];
basicTriangles[i] = basicTriangles[i + 2];
basicTriangles[i + 2] = temp;
}
var displayListIndices = new GC.Index[basicTriangles.Length];
for (int i = 0; i < basicTriangles.Length; i++)
{
var index = new GC.Index();
var basicIndex = basicTriangles[i];
index.PositionIndex = basicIndex.VertexIndex;
if (useColors)
{
var color = hasColors ? basicIndex.Color : Color.White;
var colorIndex = colors.IndexOf(color);
if (colorIndex == -1)
{
colorIndex = colors.Count;
colors.Add(color);
}
index.ColorIndex = ( ushort )colorIndex;
}
else
{
var normal = hasVertexNormals ? basicGeometry.VertexNormals[basicIndex.VertexIndex] : basicIndex.Normal;
var normalIndex = normals.IndexOf(normal);
if (normalIndex == -1)
{
normalIndex = normals.Count;
normals.Add(normal);
}
index.NormalIndex = ( ushort )normalIndex;
}
if (hasUVs)
{
var uv = basicIndex.UV;
var uvIndex = uvs.IndexOf(uv);
if (uvIndex == -1)
{
uvIndex = uvs.Count;
uvs.Add(uv);
}
index.UVIndex = ( ushort )uvIndex;
}
displayListIndices[i] = index;
}
var displayList = new GC.GXDisplayList(GC.GXPrimitive.Triangles, displayListIndices);
mesh.DisplayLists.Add(displayList);
geometry.OpaqueMeshes.Add(mesh);
}
if (normals.Count > 0)
{
if (normals.Count > byte.MaxValue)
{
foreach (var param in indexFlagsParams)
{
if (param.Flags.HasFlag(GC.IndexAttributeFlags.HasNormal))
{
param.Flags |= GC.IndexAttributeFlags.Normal16BitIndex;
}
}
}
geometry.VertexBuffers.Add(new GC.VertexNormalBuffer(normals.ToArray()));
}
if (colors.Count > 0)
{
if (colors.Count > byte.MaxValue)
{
foreach (var param in indexFlagsParams)
{
if (param.Flags.HasFlag(GC.IndexAttributeFlags.HasColor))
{
param.Flags |= GC.IndexAttributeFlags.Color16BitIndex;
}
}
}
geometry.VertexBuffers.Add(new GC.VertexColorBuffer(colors.ToArray()));
}
if (uvs.Count > 0)
{
if (uvs.Count > byte.MaxValue)
{
foreach (var param in indexFlagsParams)
{
if (param.Flags.HasFlag(GC.IndexAttributeFlags.HasUV))
{
param.Flags |= GC.IndexAttributeFlags.UV16BitIndex;
}
}
}
geometry.VertexBuffers.Add(new GC.VertexUVBuffer(uvs.ToArray()));
}
geometry.Bounds = basicGeometry.Bounds;
return(geometry);
}
private static Node ConvertNode(Assimp.Node aiNode, List <Assimp.Mesh> aiMeshes, List <MaterialBuildInfo> materialBuildInfos)
{
Node ConvertHierarchyNodeRecursively(Assimp.Node curAiNode, ref Node previousSibling, Node parent, ref Assimp.Matrix4x4 parentNodeWorldTransform)
{
var nodeWorldTransform = curAiNode.Transform * parentNodeWorldTransform;
var nodeInverseWorldTransform = nodeWorldTransform;
nodeInverseWorldTransform.Inverse();
curAiNode.Transform.Decompose(out var scale, out var rotation, out var translation);
// Create node
var node = new Node(AssimpHelper.FromAssimp(translation), AngleVector.FromQuaternion(AssimpHelper.FromAssimp(rotation)),
AssimpHelper.FromAssimp(scale), parent);
if (curAiNode.HasMeshes)
{
var geometry = new Geometry();
// Convert meshes
var vertexPositions = new List <Assimp.Vector3D>();
var vertexNormals = new List <Assimp.Vector3D>();
var vertexUVs = new List <Assimp.Vector3D>();
var vertexColors = new List <Assimp.Color4D>();
var lastRenderState = new MeshRenderState();
foreach (var aiMeshIndex in curAiNode.MeshIndices)
{
var aiMesh = aiMeshes[aiMeshIndex];
var material = materialBuildInfos[aiMesh.MaterialIndex];
var mesh = new Mesh();
var renderState = new MeshRenderState();
renderState.IndexFlags = IndexAttributeFlags.HasPosition | IndexAttributeFlags.Position16BitIndex;
var useColors = false;
var hasColors = aiMesh.HasVertexColors(0);
var hasUVs = aiMesh.HasTextureCoords(0);
var hasNormals = aiMesh.HasNormals;
if (hasColors || !hasNormals)
{
renderState.IndexFlags |= IndexAttributeFlags.HasColor | IndexAttributeFlags.Color16BitIndex;
useColors = true;
}
else
{
renderState.IndexFlags |= IndexAttributeFlags.HasNormal | IndexAttributeFlags.Normal16BitIndex;
}
if (hasUVs)
{
renderState.IndexFlags |= IndexAttributeFlags.HasUV | IndexAttributeFlags.UV16BitIndex;
}
// Convert faces
var triangleIndices = new Index[aiMesh.FaceCount * 3];
for (var i = 0; i < aiMesh.Faces.Count; i++)
{
var aiFace = aiMesh.Faces[i];
Debug.Assert(aiFace.IndexCount == 3);
for (var j = 0; j < aiFace.Indices.Count; j++)
{
int aiFaceIndex = aiFace.Indices[j];
var position = aiMesh.Vertices[aiFaceIndex];
var positionIndex = vertexPositions.IndexOf(position);
if (positionIndex == -1)
{
positionIndex = vertexPositions.Count;
vertexPositions.Add(position);
}
var normalIndex = 0;
var colorIndex = 0;
var uvIndex = 0;
if (useColors)
{
var color = hasColors ? aiMesh.VertexColorChannels[0][aiFaceIndex] : new Assimp.Color4D();
colorIndex = vertexColors.IndexOf(color);
if (colorIndex == -1)
{
colorIndex = vertexColors.Count;
vertexColors.Add(color);
}
}
else
{
var normal = aiMesh.Normals[aiFaceIndex];
normalIndex = vertexNormals.IndexOf(normal);
if (normalIndex == -1)
{
normalIndex = vertexNormals.Count;
vertexNormals.Add(normal);
}
}
if (hasUVs)
{
var uv = aiMesh.TextureCoordinateChannels[0][aiFaceIndex];
uvIndex = vertexUVs.IndexOf(uv);
if (uvIndex == -1)
{
uvIndex = vertexUVs.Count;
vertexUVs.Add(uv);
}
}
triangleIndices[(i * 3) + j] = new Index
{
PositionIndex = ( ushort )positionIndex,
NormalIndex = ( ushort )normalIndex,
ColorIndex = ( ushort )colorIndex,
UVIndex = ( ushort )uvIndex
};
}
}
// Build display list
var displayList = new GXDisplayList(GXPrimitive.Triangles, triangleIndices);
mesh.DisplayLists.Add(displayList);
// Set up render params
var indexFlagsParam = new IndexAttributeFlagsParam(renderState.IndexFlags);
mesh.Parameters.Add(indexFlagsParam);
if (useColors)
{
mesh.Parameters.Add(new LightingParams(LightingParams.Preset.Colors));
}
else
{
mesh.Parameters.Add(new LightingParams(LightingParams.Preset.Normals));
}
mesh.Parameters.Add(new TextureParams(( ushort )(material.TextureId)));
mesh.Parameters.Add(new MipMapParams());
geometry.OpaqueMeshes.Add(mesh);
}
// Build vertex buffers
if (vertexPositions.Count > 0)
{
geometry.VertexBuffers.Add(new VertexPositionBuffer(vertexPositions.Select(x =>
{
Assimp.Unmanaged.AssimpLibrary.Instance.TransformVecByMatrix4(ref x, ref nodeInverseWorldTransform);
return(AssimpHelper.FromAssimp(x));
}).ToArray()));
}
if (vertexNormals.Count > 0)
{
nodeInverseWorldTransform.Transpose();
geometry.VertexBuffers.Add(new VertexNormalBuffer(vertexNormals.Select(x =>
{
Assimp.Unmanaged.AssimpLibrary.Instance.TransformVecByMatrix4(ref x, ref nodeInverseWorldTransform);
return(AssimpHelper.FromAssimp(x));
}).ToArray()));
}
if (vertexColors.Count > 0)
{
geometry.VertexBuffers.Add(new VertexColorBuffer(vertexColors.Select(AssimpHelper.FromAssimp).ToArray()));
}
if (vertexUVs.Count > 0)
{
geometry.VertexBuffers.Add(new VertexUVBuffer(vertexUVs.Select(x =>
UVCodec.Encode1023(AssimpHelper
.FromAssimpAsVector2(x)))
.ToArray()));
}
}
// Set sibling (next) reference of previous
if (previousSibling != null)
{
previousSibling.Sibling = node;
}
previousSibling = node;
if (curAiNode.HasChildren)
{
Node childPreviousSibling = null;
foreach (var aiChildNode in curAiNode.Children)
{
var childNode = ConvertHierarchyNodeRecursively(aiChildNode, ref childPreviousSibling, node, ref nodeWorldTransform);
// Make sure to set the 'first child' reference if we haven't already
if (node.Child == null)
{
node.Child = childNode;
}
}
}
return(node);
}
// Dummy!
Node dummy = null;
var identity = Assimp.Matrix4x4.Identity;
return(ConvertHierarchyNodeRecursively(aiNode, ref dummy, null, ref identity));
}
