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 MeshPrimitive WithVertexAccessors <TvP, TvM, TvS>(this MeshPrimitive primitive, IReadOnlyList <(TvP Geo, TvM Mat, TvS Skin)> vertices)
public static IEnumerable <(IVertexBuilder A, Material Material)> EvaluatePoints(this MeshPrimitive prim, MESHXFORM xform = null)
{
if (prim == null)
{
yield break;
}
if (xform != null && !xform.Visible)
{
yield break;
}
var points = prim.GetPointIndices();
if (!points.Any())
{
yield break;
}
var vertices = prim.GetVertexColumns(xform);
var vtype = vertices.GetCompatibleVertexType();
foreach (var t in points)
{
var a = vertices.GetVertex(vtype, t);
yield return(a, prim.Material);
}
}
public static IEnumerable <(IVertexBuilder A, IVertexBuilder B, Material Material)> EvaluateLines(this MeshPrimitive prim, MESHXFORM xform = null)
{
if (prim == null)
{
yield break;
}
if (xform != null && !xform.Visible)
{
yield break;
}
var lines = prim.GetLineIndices();
if (!lines.Any())
{
yield break;
}
var vertices = prim.GetVertexColumns(xform);
var vtype = vertices.GetCompatibleVertexType();
foreach (var(la, lb) in lines)
{
var va = vertices.GetVertex(vtype, la);
var vb = vertices.GetVertex(vtype, lb);
yield return(va, vb, prim.Material);
}
}
public static MeshPrimitive WithVertexAccessors <TVertex, TValues>(this MeshPrimitive primitive, IReadOnlyList <(TVertex, TValues)> vertices)
public static MeshPrimitive WithVertexAccessors <TvP, TvM>(this MeshPrimitive primitive, IReadOnlyList <(TvP, TvM)> vertices)
static IEnumerable <Vertex> GetVerticesFromPrimitive(GLTF.MeshPrimitive prim)
{
var pos = prim.VertexAccessors["POSITION"];
//pos = prim.GetVertexAccessor("POSITON");
var result = pos.AsVector3Array().Select((p, idx) => {
return(new Vertex {
pos = p
});
});
prim.VertexAccessors.TryGetValue("NORMAL", out var normal);
if (normal != null && normal.Count > 0)
{
var na = normal.AsVector3Array();
result = result.Select((vtx, idx) => { vtx.normal = na[idx]; return(vtx); });
}
prim.VertexAccessors.TryGetValue("TANGENT", out var tangent);
if (tangent != null && tangent.Count > 0)
{
var ta = tangent.AsVector4Array();
result = result.Select((vtx, idx) =>
{
var et = ta[idx];
var tangent_vector = new Vector3(et.X, et.Y, et.Z);
var binormal = Vector3.Cross(tangent_vector, vtx.normal.Value) * et.W;
vtx.tangent = tangent_vector;
vtx.binormal = binormal;
return(vtx);
});
}
prim.VertexAccessors.TryGetValue("COLOR_0", out var vcols);
if (vcols != null && vcols.Count > 0)
{
if (vcols.Dimensions == GLTF.DimensionType.VEC4)
{
var vca = vcols.AsVector4Array();
result = result.Select((vtx, idx) => { vtx.vtx_col = vca[idx]; return(vtx); });
}
else
{
var vca = vcols.AsVector3Array();
// TODO: Does Diesel have opaque be 1, 0, or 255?
result = result.Select((vtx, idx) => { vtx.vtx_col = new Vector4(vca[idx], 1.0f); return(vtx); });
}
}
for (int i = 0; i < 8; i++)
{
var ii = i; // Closures capture by reference, and i is declared outside the loop body in for.
prim.VertexAccessors.TryGetValue($"TEXCOORD_{ii}", out var uvs);
if (uvs != null && uvs.Count > 0)
{
var uva = uvs.AsVector2Array();
result = result.Select((vtx, idx) => { vtx.uv[ii] = new Vector2(uva[idx].X, 1 - uva[idx].Y); return(vtx); });
}
}
prim.VertexAccessors.TryGetValue("JOINTS_0", out var joints);
prim.VertexAccessors.TryGetValue("WEIGHTS_0", out var weights);
if (joints != null && joints.Count > 0)
{
var ja = joints.AsVector4Array();
var wa = joints.AsVector4Array();
result = result.Select((vtx, idx) =>
{
var gltfWeight = ja[idx];
vtx.weight = new Vector3(gltfWeight.X, gltfWeight.Y, gltfWeight.Z);
if (gltfWeight.W > 0)
{
Log.Default.Warn($"{prim.LogicalParent.Name} has a vertex with >3 weights at {vtx.pos}!");
}
vtx.weightGroups = new DM.GeometryWeightGroups(
(ushort)wa[idx].X,
(ushort)wa[idx].Y,
(ushort)wa[idx].Z,
(ushort)wa[idx].W
);
return(vtx);
});
}
return(result);
}
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);
}
}
}
