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finish BuildNormals

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This commit is contained in:
yyc12345
2023-09-19 15:20:40 +08:00
parent be6cbc5692
commit 2d190ea30b
7 changed files with 225 additions and 15 deletions
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43
LibCmo/CK2/ObjImpls/CKMesh.cpp
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@ -226,6 +226,8 @@ namespace LibCmo::CK2::ObjImpls {
return true;
}
#pragma region Misc Section
void CKMesh::CleanMesh() {
// clear material channel first
SetMtlChannelCount(0);
@ -236,9 +238,46 @@ namespace LibCmo::CK2::ObjImpls {
SetLineCount(0);
}
void CKMesh::BuildNormals() {}
void CKMesh::BuildNormals() {
if (m_FaceCount == 0 || m_VertexCount == 0) return;
void CKMesh::BuildFaceNormals() {}
// build face normal first
BuildFaceNormals();
// iterate all face and add face normal to each point's normal
for (CKDWORD fid = 0; fid < m_FaceCount; ++fid) {
m_VertexNormal[m_FaceIndices[fid * 3]] += m_Faces[fid].m_Normal;
m_VertexNormal[m_FaceIndices[fid * 3 + 1]] += m_Faces[fid].m_Normal;
m_VertexNormal[m_FaceIndices[fid * 3 + 2]] += m_Faces[fid].m_Normal;
}
// then normalize all vertex normal
for (auto& nml : m_VertexNormal) {
nml.Normalized();
}
}
void CKMesh::BuildFaceNormals() {
if (m_FaceCount == 0 || m_VertexCount == 0) return;
// iertate all face to build face normal according to position data
for (CKDWORD fid = 0; fid < m_FaceCount; ++fid) {
VxMath::VxVector3 *p0 = &m_VertexPosition[m_FaceIndices[fid * 3]];
VxMath::VxVector3 p0_p1 = m_VertexPosition[m_FaceIndices[fid * 3 + 1]] - *p0,
p0_p2 = m_VertexPosition[m_FaceIndices[fid * 3 + 2]] - *p0;
// cross product to get normal
// and normalize it
VxMath::VxVector3 nml = VxMath::NSVxVector::CrossProduct(p0_p1, p0_p2);
nml.Normalized();
// assign it
m_Faces[fid].m_Normal = nml;
}
}
#pragma endregion
#pragma region Vertex Section