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Fixed get triangles of mesh #510

This commit is contained in:
Perfare 2020-03-30 08:52:16 +08:00
parent a30a0d0bc5
commit 687b1d3a0d
1 changed files with 68 additions and 36 deletions
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104
AssetStudio/Classes/Mesh.cs
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@ -396,11 +396,21 @@ namespace AssetStudio
} }
} }
public enum GfxPrimitiveType : int
{
kPrimitiveTriangles = 0,
kPrimitiveTriangleStrip = 1,
kPrimitiveQuads = 2,
kPrimitiveLines = 3,
kPrimitiveLineStrip = 4,
kPrimitivePoints = 5,
};
public class SubMesh public class SubMesh
{ {
public uint firstByte; public uint firstByte;
public uint indexCount; public uint indexCount;
public int topology; public GfxPrimitiveType topology;
public uint triangleCount; public uint triangleCount;
public uint baseVertex; public uint baseVertex;
public uint firstVertex; public uint firstVertex;
@ -413,7 +423,7 @@ namespace AssetStudio
firstByte = reader.ReadUInt32(); firstByte = reader.ReadUInt32();
indexCount = reader.ReadUInt32(); indexCount = reader.ReadUInt32();
topology = reader.ReadInt32(); topology = (GfxPrimitiveType)reader.ReadInt32();
if (version[0] < 4) //4.0 down if (version[0] < 4) //4.0 down
{ {
@ -460,7 +470,7 @@ namespace AssetStudio
private CompressedMesh m_CompressedMesh; private CompressedMesh m_CompressedMesh;
private StreamingInfo m_StreamData; private StreamingInfo m_StreamData;
public List<uint> m_Indices = new List<uint>(); //use a list because I don't always know the facecount for triangle strips public List<uint> m_Indices = new List<uint>();
public Mesh(ObjectReader reader) : base(reader) public Mesh(ObjectReader reader) : base(reader)
{ {
@ -684,7 +694,7 @@ namespace AssetStudio
DecompressCompressedMesh(); DecompressCompressedMesh();
} }
BuildFaces(); GetTriangles();
} }
private void ReadVertexData() private void ReadVertexData()
@ -1037,7 +1047,7 @@ namespace AssetStudio
} }
} }
private void BuildFaces() private void GetTriangles()
{ {
foreach (var m_SubMesh in m_SubMeshes) foreach (var m_SubMesh in m_SubMeshes)
{ {
@ -1046,43 +1056,65 @@ namespace AssetStudio
{ {
firstIndex /= 2; firstIndex /= 2;
} }
var indexCount = m_SubMesh.indexCount;
if (m_SubMesh.topology == 0) var topology = m_SubMesh.topology;
if (topology == GfxPrimitiveType.kPrimitiveTriangles)
{ {
for (int i = 0; i < m_SubMesh.indexCount / 3; i++) for (int i = 0; i < indexCount; i += 3)
{ {
m_Indices.Add(m_IndexBuffer[firstIndex + i * 3]); m_Indices.Add(m_IndexBuffer[firstIndex + i]);
m_Indices.Add(m_IndexBuffer[firstIndex + i * 3 + 1]); m_Indices.Add(m_IndexBuffer[firstIndex + i + 1]);
m_Indices.Add(m_IndexBuffer[firstIndex + i * 3 + 2]); m_Indices.Add(m_IndexBuffer[firstIndex + i + 2]);
} }
} }
else if (version[0] < 4 || topology == GfxPrimitiveType.kPrimitiveTriangleStrip)
{
// de-stripify :
uint triIndex = 0;
for (int i = 0; i < indexCount - 2; i++)
{
var a = m_IndexBuffer[firstIndex + i];
var b = m_IndexBuffer[firstIndex + i + 1];
var c = m_IndexBuffer[firstIndex + i + 2];
// skip degenerates
if (a == b || a == c || b == c)
continue;
// do the winding flip-flop of strips :
if ((i & 1) == 1)
{
m_Indices.Add(b);
m_Indices.Add(a);
}
else
{
m_Indices.Add(a);
m_Indices.Add(b);
}
m_Indices.Add(c);
triIndex += 3;
}
//fix indexCount
m_SubMesh.indexCount = triIndex;
}
else if (topology == GfxPrimitiveType.kPrimitiveQuads)
{
for (int q = 0; q < indexCount; q += 4)
{
m_Indices.Add(m_IndexBuffer[firstIndex + q]);
m_Indices.Add(m_IndexBuffer[firstIndex + q + 1]);
m_Indices.Add(m_IndexBuffer[firstIndex + q + 2]);
m_Indices.Add(m_IndexBuffer[firstIndex + q]);
m_Indices.Add(m_IndexBuffer[firstIndex + q + 2]);
m_Indices.Add(m_IndexBuffer[firstIndex + q + 3]);
}
//fix indexCount
m_SubMesh.indexCount = indexCount / 2 * 3;
}
else else
{ {
uint j = 0; throw new NotSupportedException("Failed getting triangles. Submesh topology is lines or points.");
for (int i = 0; i < m_SubMesh.indexCount - 2; i++)
{
uint fa = m_IndexBuffer[firstIndex + i];
uint fb = m_IndexBuffer[firstIndex + i + 1];
uint fc = m_IndexBuffer[firstIndex + i + 2];
if ((fa != fb) && (fa != fc) && (fc != fb))
{
m_Indices.Add(fa);
if ((i % 2) == 0)
{
m_Indices.Add(fb);
m_Indices.Add(fc);
}
else
{
m_Indices.Add(fc);
m_Indices.Add(fb);
}
j++;
}
}
//fix indexCount
m_SubMesh.indexCount = j * 3;
} }
} }
} }