public ObjectNormal(Object obj)
{
var faceCount = obj.FaceCount;
var vertCount = obj.VertexCount;
var faceN = new Point[faceCount];
var vi = new int[4];
normal = new Point[faceCount * 4];
for (int i = 0; i < faceCount; i++)
{
var count = obj.GetFacePointCount(i);
switch (count)
{
case 3:
obj.GetFacePointArray(i, vi);
faceN[i] = Point.GetNormal
(
obj.GetVertex(vi[0]),
obj.GetVertex(vi[1]),
obj.GetVertex(vi[2])
);
break;
case 4:
obj.GetFacePointArray(i, vi);
faceN[i] = Point.GetNormal
(
obj.GetVertex(vi[0]),
obj.GetVertex(vi[1]),
obj.GetVertex(vi[2]),
obj.GetVertex(vi[3])
);
break;
}
}
switch (obj.Shading)
{
case ObjectShade.Flat:
for (int i = 0; i < faceCount; i++)
{
var count = obj.GetFacePointCount(i);
for (int j = 0; j < count; j++)
normal[i * 4 + j] = faceN[i];
}
break;
case ObjectShade.Gouraud:
{
var facet = Math.Cos(MathHelper.ToRadians(obj.SmoothAngle));
var vtbl = new GouraudHash[faceCount][];
var hash = new GouraudHash[vertCount + faceCount * 4];
var hashCount = vertCount;
for (var i = 0; i < faceCount; i++)
{
var cvt = vtbl[i];
var count = obj.GetFacePointCount(i);
if (cvt == null)
cvt = vtbl[i] = new GouraudHash[4];
if (count < 3)
continue;
obj.GetFacePointArray(i, vi);
for (int j = 0; j < count; j++)
{
var chs = hash[vi[j]] ?? (hash[vi[j]] = new GouraudHash());
if (chs.Count == 0)
{
chs.NV = faceN[i];
chs.Count++;
cvt[j] = chs;
continue;
}
var pa = faceN[i];
var da = pa.GetSizeSquared();
for (; ; chs = chs.Next)
{
var c = 0f;
if (da > 0)
{
var pb = chs.NV;
var db = pb.GetSizeSquared();
if (db > 0)
c = Point.GetInnerProduct(pa, pb) / (float)Math.Sqrt(da * db);
}
if (c >= facet)
{
chs.NV += pa;
chs.Count++;
cvt[j] = chs;
}
if (chs.Next == null)
{
cvt[j] = chs.Next = hash[hashCount++] ?? (hash[hashCount] = new GouraudHash());
chs = chs.Next;
chs.NV = pa;
chs.Count = 1;
chs.Next = null;
break;
}
}
}
}
for (int i = 0; i < hashCount; i++)
{
var chs = hash[i] ?? (hash[i] = new GouraudHash());
if (chs.Count > 1)
chs.NV = chs.NV.Normalize();
}
for (int i = 0; i < faceCount; i++)
{
var cvt = vtbl[i];
var count = obj.GetFacePointCount(i);
if (count < 3)
continue;
for (int j = 0; j < count; j++)
normal[i * 4 + j] = cvt[j].NV;
}
}
break;
}
}
public ObjectNormal(Object obj)
{
var faceCount = obj.FaceCount;
var vertCount = obj.VertexCount;
var faceN = new Point[faceCount];
var vi = new int[4];
normal = new Point[faceCount * 4];
for (int i = 0; i < faceCount; i++)
{
var count = obj.GetFacePointCount(i);
switch (count)
{
case 3:
obj.GetFacePointArray(i, vi);
faceN[i] = Point.GetNormal
(
obj.GetVertex(vi[0]),
obj.GetVertex(vi[1]),
obj.GetVertex(vi[2])
);
break;
case 4:
obj.GetFacePointArray(i, vi);
faceN[i] = Point.GetNormal
(
obj.GetVertex(vi[0]),
obj.GetVertex(vi[1]),
obj.GetVertex(vi[2]),
obj.GetVertex(vi[3])
);
break;
}
}
switch (obj.Shading)
{
case ObjectShade.Flat:
for (int i = 0; i < faceCount; i++)
{
var count = obj.GetFacePointCount(i);
for (int j = 0; j < count; j++)
{
normal[i * 4 + j] = faceN[i];
}
}
break;
case ObjectShade.Gouraud:
{
var facet = Math.Cos(MathHelper.ToRadians(obj.SmoothAngle));
var vtbl = new GouraudHash[faceCount][];
var hash = new GouraudHash[vertCount + faceCount * 4];
var hashCount = vertCount;
for (var i = 0; i < faceCount; i++)
{
var cvt = vtbl[i];
var count = obj.GetFacePointCount(i);
if (cvt == null)
{
cvt = vtbl[i] = new GouraudHash[4];
}
if (count < 3)
{
continue;
}
obj.GetFacePointArray(i, vi);
for (int j = 0; j < count; j++)
{
var chs = hash[vi[j]] ?? (hash[vi[j]] = new GouraudHash());
if (chs.Count == 0)
{
chs.NV = faceN[i];
chs.Count++;
cvt[j] = chs;
continue;
}
var pa = faceN[i];
var da = pa.GetSizeSquared();
for (; ; chs = chs.Next)
{
var c = 0f;
if (da > 0)
{
var pb = chs.NV;
var db = pb.GetSizeSquared();
if (db > 0)
{
c = Point.GetInnerProduct(pa, pb) / (float)Math.Sqrt(da * db);
}
}
if (c >= facet)
{
chs.NV += pa;
chs.Count++;
cvt[j] = chs;
}
if (chs.Next == null)
{
cvt[j] = chs.Next = hash[hashCount++] ?? (hash[hashCount] = new GouraudHash());
chs = chs.Next;
chs.NV = pa;
chs.Count = 1;
chs.Next = null;
break;
}
}
}
}
for (int i = 0; i < hashCount; i++)
{
var chs = hash[i] ?? (hash[i] = new GouraudHash());
if (chs.Count > 1)
{
chs.NV = chs.NV.Normalize();
}
}
for (int i = 0; i < faceCount; i++)
{
var cvt = vtbl[i];
var count = obj.GetFacePointCount(i);
if (count < 3)
{
continue;
}
for (int j = 0; j < count; j++)
{
normal[i * 4 + j] = cvt[j].NV;
}
}
}
break;
}
}
