internal void PlaneDecalsMeshCutter(DM a_DecalsMesh, Plane a_Plane)
{
this.m_RelativeVertexLocations.Clear();
this.m_ObsoleteTriangleIndices.Clear();
this.m_CutEdges.Clear();
this.m_RemovedIndices.Clear();
int decalsMeshLowerVertexIndex = this.m_ActiveProjector.DecalsMeshLowerVertexIndex;
int decalsMeshUpperVertexIndex = this.m_ActiveProjector.DecalsMeshUpperVertexIndex;
int num3 = decalsMeshLowerVertexIndex;
Vector3 vector = this.PlaneOrigin(a_Plane);
Vector3 normal = a_Plane.normal;
for (int i = decalsMeshLowerVertexIndex; i <= decalsMeshUpperVertexIndex; i++)
{
Vector3 vector3 = a_DecalsMesh.Vertices[i];
RelativeVertexLocation item = this.VertexLocationRelativeToPlane(vector, normal, vector3);
this.m_RelativeVertexLocations.Add(item);
}
int count = a_DecalsMesh.Triangles.Count;
int decalsMeshLowerTriangleIndex = this.m_ActiveProjector.DecalsMeshLowerTriangleIndex;
for (int j = decalsMeshLowerTriangleIndex; j < count; j += 3)
{
int num8 = a_DecalsMesh.Triangles[j];
int num9 = a_DecalsMesh.Triangles[j + 1];
int num10 = a_DecalsMesh.Triangles[j + 2];
RelativeVertexLocation location2 = this.m_RelativeVertexLocations[num8 - num3];
RelativeVertexLocation location3 = this.m_RelativeVertexLocations[num9 - num3];
RelativeVertexLocation location4 = this.m_RelativeVertexLocations[num10 - num3];
if ((location2 != RelativeVertexLocation.Inside) && ((location3 != RelativeVertexLocation.Inside) && (location4 != RelativeVertexLocation.Inside)))
{
this.m_ObsoleteTriangleIndices.Add(j);
}
else
{
Vector3 vector4 = a_DecalsMesh.Vertices[num8];
Vector3 vector5 = a_DecalsMesh.Vertices[num9];
Vector3 vector6 = a_DecalsMesh.Vertices[num10];
bool flag = this.Intersect(location2, location3);
bool flag2 = this.Intersect(location2, location4);
bool flag3 = this.Intersect(location3, location4);
int item = 0;
int num12 = 0;
int num13 = 0;
if (flag)
{
DecalRay ray = new DecalRay(vector4, vector5 - vector4);
float num14 = this.IntersectionFactor(ray, a_Plane);
item = this.m_GetCutEdgeDelegate(num3, num8, num9, vector4, vector5, location2 == RelativeVertexLocation.Inside, num14);
}
if (flag2)
{
DecalRay ray2 = new DecalRay(vector4, vector6 - vector4);
float num15 = this.IntersectionFactor(ray2, a_Plane);
num12 = this.m_GetCutEdgeDelegate(num3, num8, num10, vector4, vector6, location2 == RelativeVertexLocation.Inside, num15);
}
if (flag3)
{
DecalRay ray3 = new DecalRay(vector5, vector6 - vector5);
float num16 = this.IntersectionFactor(ray3, a_Plane);
num13 = this.m_GetCutEdgeDelegate(num3, num9, num10, vector5, vector6, location3 == RelativeVertexLocation.Inside, num16);
}
if (flag && flag2)
{
if (location2 == RelativeVertexLocation.Inside)
{
a_DecalsMesh.Triangles[j + 1] = item;
a_DecalsMesh.Triangles[j + 2] = num12;
}
else
{
a_DecalsMesh.Triangles[j] = item;
a_DecalsMesh.Triangles.Add(num10);
a_DecalsMesh.Triangles.Add(num12);
a_DecalsMesh.Triangles.Add(item);
}
}
else if (flag && flag3)
{
if (location3 == RelativeVertexLocation.Inside)
{
a_DecalsMesh.Triangles[j] = item;
a_DecalsMesh.Triangles[j + 2] = num13;
}
else
{
a_DecalsMesh.Triangles[j + 1] = item;
a_DecalsMesh.Triangles.Add(num10);
a_DecalsMesh.Triangles.Add(item);
a_DecalsMesh.Triangles.Add(num13);
}
}
else if (flag2 && flag3)
{
if (location4 == RelativeVertexLocation.Inside)
{
a_DecalsMesh.Triangles[j] = num12;
a_DecalsMesh.Triangles[j + 1] = num13;
}
else
{
a_DecalsMesh.Triangles[j + 2] = num12;
a_DecalsMesh.Triangles.Add(num9);
a_DecalsMesh.Triangles.Add(num13);
a_DecalsMesh.Triangles.Add(num12);
}
}
else if (flag && (location4 == RelativeVertexLocation.OnPlane))
{
if (location2 == RelativeVertexLocation.Inside)
{
a_DecalsMesh.Triangles[j + 1] = item;
}
else
{
a_DecalsMesh.Triangles[j] = item;
}
}
else if (flag2 && (location3 == RelativeVertexLocation.OnPlane))
{
if (location2 == RelativeVertexLocation.Inside)
{
a_DecalsMesh.Triangles[j + 2] = num12;
}
else
{
a_DecalsMesh.Triangles[j] = num12;
}
}
else if (flag3 && (location2 == RelativeVertexLocation.OnPlane))
{
if (location3 == RelativeVertexLocation.Inside)
{
a_DecalsMesh.Triangles[j + 2] = num13;
}
else
{
a_DecalsMesh.Triangles[j + 1] = num13;
}
}
}
}
int num17 = this.m_ObsoleteTriangleIndices.Count - 1;
while (num17 >= 0)
{
int num18 = this.m_ObsoleteTriangleIndices[num17];
int num19 = 1;
while (true)
{
if ((num17 <= 0) || ((num18 - 3) != this.m_ObsoleteTriangleIndices[num17 - 1]))
{
a_DecalsMesh.RemoveTrianglesAt(num18, num19);
num17--;
break;
}
num18 -= 3;
num19++;
num17--;
}
}
for (int k = 0; k < this.m_RelativeVertexLocations.Count; k++)
{
if (((RelativeVertexLocation)this.m_RelativeVertexLocations[k]) == RelativeVertexLocation.Outside)
{
this.m_RemovedIndices.AddRemovedIndex(k + num3);
}
}
a_DecalsMesh.RemoveAndAdjustIndices(decalsMeshLowerTriangleIndex, this.m_RemovedIndices);
this.m_ActiveProjector.IsUV1ProjectionCalculated = false;
this.m_ActiveProjector.IsUV2ProjectionCalculated = false;
this.m_ActiveProjector.IsTangentProjectionCalculated = false;
}
private float IntersectionFactor(DecalRay a_Ray, Plane a_Plane) => (a_Plane.distance - Vector3.Dot(a_Plane.normal, a_Ray.origin)) / Vector3.Dot(a_Plane.normal, a_Ray.direction);