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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 uint firstByte;
public uint indexCount;
public int topology;
public GfxPrimitiveType topology;
public uint triangleCount;
public uint baseVertex;
public uint firstVertex;
@ -413,7 +423,7 @@ namespace AssetStudio
firstByte = reader.ReadUInt32();
indexCount = reader.ReadUInt32();
topology = reader.ReadInt32();
topology = (GfxPrimitiveType)reader.ReadInt32();
if (version[0] < 4) //4.0 down
{
@ -460,7 +470,7 @@ namespace AssetStudio
private CompressedMesh m_CompressedMesh;
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)
{
@ -684,7 +694,7 @@ namespace AssetStudio
DecompressCompressedMesh();
}
BuildFaces();
GetTriangles();
}
private void ReadVertexData()
@ -1037,7 +1047,7 @@ namespace AssetStudio
}
}
private void BuildFaces()
private void GetTriangles()
{
foreach (var m_SubMesh in m_SubMeshes)
{
@ -1046,43 +1056,65 @@ namespace AssetStudio
{
firstIndex /= 2;
}
if (m_SubMesh.topology == 0)
var indexCount = m_SubMesh.indexCount;
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 * 3 + 1]);
m_Indices.Add(m_IndexBuffer[firstIndex + i * 3 + 2]);
m_Indices.Add(m_IndexBuffer[firstIndex + i]);
m_Indices.Add(m_IndexBuffer[firstIndex + i + 1]);
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
{
uint j = 0;
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;
throw new NotSupportedException("Failed getting triangles. Submesh topology is lines or points.");
}
}
}