private static void _AddSphereFace(IPrimitiveBuilder primitiveBuilder, Matrix4x4 xform, Vector3 a, Vector3 b, Vector3 c, int iterations = 0)
{
if (iterations <= 0)
{
var tt = (a + b + c) / 3.0f;
var aa = _CreateVertex(a, xform);
var bb = _CreateVertex(b, xform);
var cc = _CreateVertex(c, xform);
primitiveBuilder.AddTriangle(aa, bb, cc);
return;
}
--iterations;
var ab = Vector3.Normalize(a + b) * a.Length();
var bc = Vector3.Normalize(b + c) * b.Length();
var ca = Vector3.Normalize(c + a) * c.Length();
// central triangle
_AddSphereFace(primitiveBuilder, xform, ab, bc, ca, iterations);
// vertex triangles
_AddSphereFace(primitiveBuilder, xform, a, ab, ca, iterations);
_AddSphereFace(primitiveBuilder, xform, b, bc, ab, iterations);
_AddSphereFace(primitiveBuilder, xform, c, ca, bc, iterations);
}
private static void _AddCubeFace(IPrimitiveBuilder primitiveBuilder, Vector3 origin, Vector3 axisX, Vector3 axisY, Matrix4x4 xform)
{
var p1 = Vector3.Transform(origin - axisX - axisY, xform);
var p2 = Vector3.Transform(origin + axisX - axisY, xform);
var p3 = Vector3.Transform(origin + axisX + axisY, xform);
var p4 = Vector3.Transform(origin - axisX + axisY, xform);
var n = Vector3.Normalize(Vector3.TransformNormal(origin, xform));
primitiveBuilder.AddQuadrangle
(
new VERTEX((p1, n), (Vector4.One, Vector2.Zero)),
new VERTEX((p2, n), (Vector4.One, Vector2.UnitX)),
new VERTEX((p3, n), (Vector4.One, Vector2.One)),
new VERTEX((p4, n), (Vector4.One, Vector2.UnitY))
);
}
public static IMeshBuilder <Materials.MaterialBuilder> ToMeshBuilder(this Mesh srcMesh)
{
if (srcMesh == null)
{
return(null);
}
var vertexAttributes = srcMesh.Primitives
.SelectMany(item => item.VertexAccessors.Keys)
.Distinct()
.ToArray();
var dstMesh = MeshBuilderToolkit.CreateMeshBuilderFromVertexAttributes <Materials.MaterialBuilder>(vertexAttributes);
dstMesh.Name = srcMesh.Name;
dstMesh.Extras = srcMesh.Extras.DeepClone();
Materials.MaterialBuilder defMat = null;
var dstMaterials = new Dictionary <Material, Materials.MaterialBuilder>();
IPrimitiveBuilder GetPrimitive(Material srcMaterial, int vcount)
{
IPrimitiveBuilder dstPrim = null;
if (srcMaterial == null)
{
if (defMat == null)
{
defMat = Materials.MaterialBuilder.CreateDefault();
}
dstPrim = dstMesh.UsePrimitive(defMat, vcount);
}
else
{
if (!dstMaterials.TryGetValue(srcMaterial, out Materials.MaterialBuilder dstMat))
{
dstMat = new Materials.MaterialBuilder();
srcMaterial.CopyTo(dstMat);
dstMaterials[srcMaterial] = dstMat;
}
dstPrim = dstMesh.UsePrimitive(dstMat, vcount);
}
return(dstPrim);
}
foreach (var srcPrim in srcMesh.Primitives)
{
int vcount = 0;
if (srcPrim.GetPointIndices().Any())
{
vcount = 1;
}
if (srcPrim.GetLineIndices().Any())
{
vcount = 2;
}
if (srcPrim.GetTriangleIndices().Any())
{
vcount = 3;
}
var dstPrim = GetPrimitive(srcPrim.Material, vcount);
dstPrim.AddPrimitiveGeometry(srcPrim);
}
return(dstMesh);
}
