void BuildPrism(MeshAnalyser meshAnalyser, Vector3 extend, MeshBuilder mb)
{
foreach (var triangle in meshAnalyser.Triangles)
{
mb.AddTriangle(-triangle, new Color(1, 0, 0, 1));
mb.AddTriangle(triangle + extend, new Color(0, 0, 1, 1));
}
foreach (var edge in meshAnalyser.FindBorders())
{
var extentEdge = edge + extend;
mb.AddTriangle(new Triangle(edge.a, edge.b, extentEdge.b), new Color(0, 1, 0, 1));
mb.AddTriangle(new Triangle(edge.a, extentEdge.b, extentEdge.a), new Color(0, 1, 0, 1));
}
}
public Mesh GenerateVolumnMesh(Collider collider)
{
var lightDir = Manager.MainLight.transform.forward;
if (collider is BoxCollider)
{
var mat = collider.transform.localToWorldMatrix;
var box = collider as BoxCollider;
var verts = boxMesh.vertices;
Array.Copy(boxMeshBase.vertices, verts, boxMeshBase.vertices.Length);
boxMesh.triangles = boxMeshBase.triangles;
MeshBuilder mb = new MeshBuilder(128);
// Transform from local to world pos;
for (int i = 0; i < verts.Length; i++)
{
verts[i] = mat.MultiplyPoint(Vector3.Scale(verts[i] / 2, box.size) + box.center);
}
// Build volume mesh
MeshAnalyser meshAnalyser = new MeshAnalyser(12);
for (int i = 0; i < boxMesh.triangles.Length / 3; i++)
{
var idx = i * 3;
var triangle = new Triangle(verts[boxMesh.triangles[idx + 0]], verts[boxMesh.triangles[idx + 1]], verts[boxMesh.triangles[idx + 2]]);
if (Vector3.Dot(lightDir, triangle.normal) < 0)
{
meshAnalyser.AddTriangle(triangle);
}
/*
* if (Vector3.Dot(lightDir, triangle.normal) < 0)
* BuildPrism(-triangle, lightDir * VolumeStretchDistance, mb);*/
}
BuildPrism(meshAnalyser, lightDir * VolumeStretchDistance, mb);
return(mb.ToMesh());
}
return(null);
}
