polylist Triangles2Polylist(triangles triangles)
{
polylist poly = new polylist();
poly.count = triangles.count;
poly.input = triangles.input;
poly.material = triangles.material;
poly.name = triangles.name;
poly.p = triangles.p;
string str = "3 ";
System.Text.StringBuilder builder = new System.Text.StringBuilder(str.Length * (int)poly.count);
for (int i = 0; i < (int)poly.count; i++) builder.Append(str);
poly.vcount = builder.ToString();
return poly;
}
void AddFacesFromPolyList(polylist list, mesh mesh, ModelPrim prim, Matrix4 transform)
{
string material = list.material;
source posSrc = null;
source normalSrc = null;
source uvSrc = null;
ulong stride = 0;
int posOffset = -1;
int norOffset = -1;
int uvOffset = -1;
foreach (var inp in list.input)
{
stride = Math.Max(stride, inp.offset);
if (inp.semantic == "VERTEX")
{
posSrc = FindSource(mesh.source, mesh.vertices.input[0].source);
posOffset = (int)inp.offset;
}
else if (inp.semantic == "NORMAL")
{
normalSrc = FindSource(mesh.source, inp.source);
norOffset = (int)inp.offset;
}
else if (inp.semantic == "TEXCOORD")
{
uvSrc = FindSource(mesh.source, inp.source);
uvOffset = (int)inp.offset;
}
}
stride += 1;
if (posSrc == null) return;
var vcount = StrToArray(list.vcount);
var idx = StrToArray(list.p);
Vector3[] normals = null;
if (normalSrc != null)
{
var norVal = ((float_array)normalSrc.Item).Values;
normals = new Vector3[norVal.Length / 3];
for (int i = 0; i < normals.Length; i++)
{
normals[i] = new Vector3((float)norVal[i * 3 + 0], (float)norVal[i * 3 + 1], (float)norVal[i * 3 + 2]);
normals[i] = Vector3.TransformNormal(normals[i], transform);
normals[i].Normalize();
}
}
Vector2[] uvs = null;
if (uvSrc != null)
{
var uvVal = ((float_array)uvSrc.Item).Values;
uvs = new Vector2[uvVal.Length / 2];
for (int i = 0; i < uvs.Length; i++)
{
uvs[i] = new Vector2((float)uvVal[i * 2 + 0], (float)uvVal[i * 2 + 1]);
}
}
ModelFace face = new ModelFace();
face.MaterialID = list.material;
if (face.MaterialID != null)
{
if (MatSymTarget.ContainsKey(list.material))
{
ModelMaterial mat = Materials.Find(m => m.ID == MatSymTarget[list.material]);
if (mat != null)
{
face.Material = mat;
}
}
}
int curIdx = 0;
for (int i = 0; i < vcount.Length; i++)
{
var nvert = vcount[i];
if (nvert < 3 || nvert > 4)
{
throw new InvalidDataException("Only triangles and quads supported");
}
Vertex[] verts = new Vertex[nvert];
for (int j = 0; j < nvert; j++)
{
verts[j].Position = prim.Positions[idx[curIdx + posOffset + (int)stride * j]];
if (normals != null)
{
verts[j].Normal = normals[idx[curIdx + norOffset + (int)stride * j]];
}
if (uvs != null)
{
verts[j].TexCoord = uvs[idx[curIdx + uvOffset + (int)stride * j]];
}
}
if (nvert == 3) // add the triangle
{
face.AddVertex(verts[0]);
face.AddVertex(verts[1]);
face.AddVertex(verts[2]);
}
else if (nvert == 4) // quad, add two triangles
{
face.AddVertex(verts[0]);
face.AddVertex(verts[1]);
face.AddVertex(verts[2]);
face.AddVertex(verts[0]);
face.AddVertex(verts[2]);
face.AddVertex(verts[3]);
}
curIdx += (int)stride * nvert;
}
prim.Faces.Add(face);
}
