public static IEnumerable <(IVertexBuilder A, IVertexBuilder B, IVertexBuilder C, Material Material)> EvaluateTriangles(this MeshPrimitive prim, MESHXFORM xform = null)
{
if (prim == null)
{
yield break;
}
if (xform != null && !xform.Visible)
{
yield break;
}
var triangles = prim.GetTriangleIndices();
if (!triangles.Any())
{
yield break;
}
var vertices = prim.GetVertexColumns(xform);
var vtype = vertices.GetCompatibleVertexType();
foreach (var t in triangles)
{
var a = vertices.GetVertex(vtype, t.A);
var b = vertices.GetVertex(vtype, t.B);
var c = vertices.GetVertex(vtype, t.C);
yield return(a, b, c, prim.Material);
}
}
public static IEnumerable <(IVertexBuilder A, IVertexBuilder B, IVertexBuilder C, Material Material)> EvaluateTriangles(this MeshPrimitive prim, MESHXFORM xform = null)
{
if (prim == null)
{
yield break;
}
if (xform != null && !xform.Visible)
{
yield break;
}
var vertices = prim.GetVertexColumns();
var triangles = prim.GetTriangleIndices();
if (!triangles.Any())
{
yield break;
}
foreach (var xinst in Transforms.InstancingTransform.Evaluate(xform))
{
var xvertices = xinst != null?vertices.WithTransform(xinst) : vertices;
var vtype = vertices.GetCompatibleVertexType();
foreach (var(ta, tb, tc) in triangles)
{
var va = xvertices.GetVertex(vtype, ta);
var vb = xvertices.GetVertex(vtype, tb);
var vc = xvertices.GetVertex(vtype, tc);
yield return(va, vb, vc, prim.Material);
}
}
}