private void BuildLine(IGeometry <T> geometry, ITessellationHints hints, Vector3[] colors, IPath path)
{
var vertexDataList = new List <T>();
var indexDataList = new List <uint>();
// Draw a line
for (var i = 0; i < path.PathLocations.Length; ++i)
{
var vtx = new T();
vtx.SetPosition(path.PathLocations[i]);
vtx.SetNormal(Vector3.UnitX);
vtx.SetTexCoord(Vector2.Zero);
vtx.SetColor3(colors[0]);
vertexDataList.Add(vtx);
indexDataList.Add((uint)i);
}
geometry.VertexData = vertexDataList.ToArray();
geometry.IndexData = indexDataList.ToArray();
geometry.VertexLayout = VertexLayoutHelpers.GetLayoutDescription(typeof(T));
var pSet = DrawElements <T> .Create(
geometry,
PrimitiveTopology.LineStrip,
(uint)geometry.IndexData.Length,
1,
0,
0,
0);
geometry.PrimitiveSets.Add(pSet);
}
private void BuildCylinder(IGeometry <T> geometry, ITessellationHints hints, Vector3[] colors, IPath path)
{
var tangents = Util.Math.ComputePathTangents(path.PathLocations);
var nSegments = (int)System.Math.Floor(10f * hints.DetailRatio);
if (nSegments < 4)
{
nSegments = 4;
}
var shape = new Vector2[nSegments];
for (var i = 0; i < nSegments; ++i)
{
var theta = i * 2 * System.Math.PI / nSegments;
var r = hints.Radius;
shape[i] = new Vector2((float)(r * System.Math.Sin(theta)), (float)(r * System.Math.Cos(theta)));
}
var extrusion = Math.ExtrudeShape(shape, path.PathLocations);
// Build from quad strips
for (var j = 0; j < nSegments - 1; ++j)
{
Begin();
BuildFromIndicies(j, j + 1, extrusion, path);
End();
}
// Join the last bit...
BuildFromIndicies(nSegments - 1, 0, extrusion, path);
BuildVertexAndIndexArrays(out var vertexArray, out var indexArray, colors);
geometry.VertexData = vertexArray;
geometry.IndexData = indexArray;
geometry.VertexLayout = VertexLayoutHelpers.GetLayoutDescription(typeof(T));
var pSet = DrawElements <T> .Create(
geometry,
PrimitiveTopology.TriangleList,
(uint)geometry.IndexData.Length,
1,
0,
0,
0);
geometry.PrimitiveSets.Add(pSet);
}
internal void Build(IGeometry <T> geometry, ITessellationHints hints, Vector3[] colors, ISphere sphere)
{
if (hints.NormalsType == NormalsType.PerFace)
{
throw new ArgumentException("Per-Face Normals are not supported for spheres");
}
if (hints.ColorsType == ColorsType.ColorPerFace)
{
throw new ArgumentException("Per-Face Colors are not supported for spheres");
}
if (hints.ColorsType == ColorsType.ColorPerVertex)
{
throw new ArgumentException("Per-Vertex Colors are not supported for spheres");
}
if (colors.Length < 1)
{
throw new ArgumentException("Must provide at least one color for spheres");
}
uint numSegments = 40;
uint numRows = 20;
var ratio = hints.DetailRatio;
if (ratio > 0.0f && ratio != 1.0f)
{
numRows = (uint)(numRows * ratio);
if (numRows < MIN_NUM_ROWS)
{
numRows = MIN_NUM_ROWS;
}
numSegments = (uint)(numSegments * ratio);
if (numSegments < MIN_NUM_SEGMENTS)
{
numSegments = MIN_NUM_SEGMENTS;
}
}
var lDelta = (float)System.Math.PI / (float)numRows;
var vDelta = 1.0f / (float)numRows;
var angleDelta = (float)System.Math.PI * 2.0f / numSegments;
var texCoordHorzDelta = 1.0f / numSegments;
if (hints.CreateBackFace)
{
var lBase = -(float)System.Math.PI * 0.5f;
var rBase = 0.0f;
var zBase = -sphere.Radius;
var vBase = 0.0f;
var nzBase = -1.0f;
var nRatioBase = 0.0f;
for (uint rowi = 0; rowi < numRows; ++rowi)
{
var lTop = (float)(lBase + lDelta);
var rTop = (float)System.Math.Cos(lTop) * sphere.Radius;
var zTop = (float)System.Math.Sin(lTop) * sphere.Radius;
var vTop = vBase + vDelta;
var nzTop = (float)System.Math.Sin(lTop);
var nRatioTop = (float)System.Math.Cos(lTop);
Begin();
var angle = 0.0f;
var texCoord = 0.0f;
for (uint topi = 0; topi < numSegments;
++topi, angle += angleDelta, texCoord += texCoordHorzDelta)
{
var c = (float)System.Math.Cos(angle);
var s = (float)System.Math.Sin(angle);
Normal3f(-c * nRatioBase, -s * nRatioBase, -nzBase);
TexCoord2f(texCoord, vBase);
Vertex3f(c * rBase, s * rBase, zBase);
Normal3f(-c * nRatioTop, -s * nRatioTop, -nzTop);
TexCoord2f(texCoord, vTop);
Vertex3f(c * rTop, s * rTop, zTop);
}
// do last point by hand to ensure no round off errors.
Normal3f(-nRatioBase, 0.0f, -nzBase);
TexCoord2f(1.0f, vBase);
Vertex3f(rBase, 0.0f, zBase);
Normal3f(-nRatioTop, 0.0f, -nzTop);
TexCoord2f(1.0f, vTop);
Vertex3f(rTop, 0.0f, zTop);
End();
lBase = lTop;
rBase = rTop;
zBase = zTop;
vBase = vTop;
nzBase = nzTop;
nRatioBase = nRatioTop;
}
}
if (hints.CreateFrontFace)
{
var lBase = -(float)System.Math.PI * 0.5f;
var rBase = 0.0f;
var zBase = -sphere.Radius;
var vBase = 0.0f;
var nzBase = -1.0f;
var nRatioBase = 0.0f;
for (uint rowi = 0; rowi < numRows; ++rowi)
{
var lTop = lBase + lDelta;
var rTop = (float)System.Math.Cos(lTop) * sphere.Radius;
var zTop = (float)System.Math.Sin(lTop) * sphere.Radius;
var vTop = vBase + vDelta;
var nzTop = (float)System.Math.Sin(lTop);
var nRatioTop = (float)System.Math.Cos(lTop);
Begin();
var angle = 0.0f;
var texCoord = 0.0f;
for (uint topi = 0; topi < numSegments;
++topi, angle += angleDelta, texCoord += texCoordHorzDelta)
{
float c = (float)System.Math.Cos(angle);
float s = (float)System.Math.Sin(angle);
Normal3f(c * nRatioTop, s * nRatioTop, nzTop);
TexCoord2f(texCoord, vTop);
Vertex3f(c * rTop, s * rTop, zTop);
Normal3f(c * nRatioBase, s * nRatioBase, nzBase);
TexCoord2f(texCoord, vBase);
Vertex3f(c * rBase, s * rBase, zBase);
}
// do last point by hand to ensure no round off errors.
Normal3f(nRatioTop, 0.0f, nzTop);
TexCoord2f(1.0f, vTop);
Vertex3f(rTop, 0.0f, zTop);
Normal3f(nRatioBase, 0.0f, nzBase);
TexCoord2f(1.0f, vBase);
Vertex3f(rBase, 0.0f, zBase);
End();
lBase = lTop;
rBase = rTop;
zBase = zTop;
vBase = vTop;
nzBase = nzTop;
nRatioBase = nRatioTop;
}
}
BuildVertexAndIndexArrays(out var vertexArray, out var indexArray, colors);
geometry.VertexData = vertexArray;
geometry.IndexData = indexArray;
geometry.VertexLayout = VertexLayoutHelpers.GetLayoutDescription(typeof(T));
var pSet = DrawElements <T> .Create(
geometry,
PrimitiveTopology.TriangleList,
(uint)geometry.IndexData.Length,
1,
0,
0,
0);
geometry.PrimitiveSets.Add(pSet);
}
internal static void Build(IGeometry <T> geometry, ITessellationHints hints, Vector3 [] colors, IBox box)
{
var dx = box.HalfLengths.X;
var dy = box.HalfLengths.Y;
var dz = box.HalfLengths.Z;
var normVec = Vector3.Normalize(box.HalfLengths);
var nx = normVec.X;
var ny = normVec.Y;
var nz = normVec.Z;
var vertices = new Vector3[8]
{
new Vector3(-dx, +dy, -dz), // T1, L1, Bk2
new Vector3(+dx, +dy, -dz), // T2, R2, Bk1
new Vector3(+dx, +dy, +dz), // T3, R1, F2
new Vector3(-dx, +dy, +dz), // T4, L2, F1
new Vector3(-dx, -dy, -dz), // B4, L4, Bk3
new Vector3(+dx, -dy, -dz), // B3, R3, Bk4
new Vector3(+dx, -dy, +dz), // B2, R4, F3
new Vector3(-dx, -dy, +dz), // B1, L3, F4
};
Vector3[] normals;
if (hints.NormalsType == NormalsType.PerVertex)
{
normals = new Vector3[8]
{
new Vector3(-nx, +ny, -nz), // T1, L1, Bk2
new Vector3(+nx, +ny, -nz), // T2, R2, Bk1
new Vector3(+nx, +ny, +nz), // T3, R1, F2
new Vector3(-nx, +ny, +nz), // T4, L2, F1
new Vector3(-nx, -ny, -nz), // B4, L4, Bk3
new Vector3(+nx, -ny, -nz), // B3, R3, Bk4
new Vector3(+nx, -ny, +nz), // B2, R4, F3
new Vector3(-nx, -ny, +nz), // B1, L3, F4
};
}
else
{
normals = new Vector3[6]
{
new Vector3(0, 1, 0), // T
new Vector3(0, -1, 0), // B
new Vector3(1, 0, 0), // R
new Vector3(-1, 0, 0), // L
new Vector3(0, 0, 1), // F
new Vector3(0, 0, -1) // Bk
};
}
var texcoords = new Vector2[4]
{
new Vector2(+0, +0),
new Vector2(+0, +1),
new Vector2(+1, +1),
new Vector2(+1, +0)
};
var faces = new Face[6]
{
new Face(), // T
new Face(), // B
new Face(), // R
new Face(), // L
new Face(), // F
new Face() // B
};
// Set Positions
{
faces[0].VertexIndices.AddRange(new uint[] { 0, 1, 2, 3 }); // T
faces[1].VertexIndices.AddRange(new uint[] { 7, 6, 5, 4 }); // B
faces[2].VertexIndices.AddRange(new uint[] { 2, 1, 5, 6 }); // R
faces[3].VertexIndices.AddRange(new uint[] { 0, 3, 7, 4 }); // L
faces[4].VertexIndices.AddRange(new uint[] { 3, 2, 6, 7 }); // F
faces[5].VertexIndices.AddRange(new uint[] { 1, 0, 4, 5 }); // B
}
// Set Tex Coords
{
for (uint i = 0; i < 6; ++i)
{
faces[i].TexCoordIndices.AddRange(new uint[] { 0, 1, 2, 3 });
}
}
// Set Normals
if (hints.NormalsType == NormalsType.PerVertex)
{
faces[0].NormalIndices.AddRange(new uint[] { 0, 1, 2, 3 }); // T
faces[1].NormalIndices.AddRange(new uint[] { 7, 6, 5, 4 }); // B
faces[2].NormalIndices.AddRange(new uint[] { 2, 1, 5, 6 }); // R
faces[3].NormalIndices.AddRange(new uint[] { 0, 3, 7, 4 }); // L
faces[4].NormalIndices.AddRange(new uint[] { 3, 2, 6, 7 }); // F
faces[5].NormalIndices.AddRange(new uint[] { 1, 0, 4, 5 }); // B
}
else // Per face Normals
{
for (uint i = 0; i < 6; ++i)
{
faces[i].NormalIndices.AddRange(new uint[] { i, i, i, i });
}
}
// Set Colors
{
switch (hints.ColorsType)
{
case ColorsType.ColorOverall:
default:
{
if (colors.Length < 1)
{
throw new Exception("Not enough colors specified");
}
for (uint i = 0; i < 6; ++i)
{
faces[i].ColorIndices.AddRange(new uint[] { 0, 0, 0, 0 });
}
break;
}
case ColorsType.ColorPerFace:
{
if (colors.Length < 6)
{
throw new Exception("Not enough colors specified for per-face coloring");
}
for (uint i = 0; i < 6; ++i)
{
faces[i].ColorIndices.AddRange(new uint[] { i, i, i, i });
}
break;
}
case ColorsType.ColorPerVertex:
{
if (colors.Length < 8)
{
throw new Exception("Not enough colors specified for per-vertex coloring");
}
faces[0].ColorIndices.AddRange(new uint[] { 0, 1, 2, 3 }); // T
faces[1].ColorIndices.AddRange(new uint[] { 7, 6, 5, 4 }); // B
faces[2].ColorIndices.AddRange(new uint[] { 2, 1, 5, 6 }); // R
faces[3].ColorIndices.AddRange(new uint[] { 0, 3, 7, 4 }); // L
faces[4].ColorIndices.AddRange(new uint[] { 3, 2, 6, 7 }); // F
faces[5].ColorIndices.AddRange(new uint[] { 1, 0, 4, 5 }); // B
break;
}
}
}
var vertexDataList = new List <T>();
foreach (var face in faces)
{
for (var i = 0; i < face.VertexIndices.Count; ++i)
{
var vtx = new T();
vtx.SetPosition(vertices[face.VertexIndices[i]]);
vtx.SetNormal(normals[face.NormalIndices[i]]);
vtx.SetColor3(colors[face.ColorIndices[i]]);
vtx.SetTexCoord(texcoords[face.TexCoordIndices[i]]);
vertexDataList.Add(vtx);
}
}
geometry.VertexData = vertexDataList.ToArray();
uint[] indices =
{
0, 1, 2, 0, 2, 3,
4, 5, 6, 4, 6, 7,
8, 9, 10, 8, 10, 11,
12, 13, 14, 12, 14, 15,
16, 17, 18, 16, 18, 19,
20, 21, 22, 20, 22, 23,
};
geometry.IndexData = indices;
geometry.VertexLayout = VertexLayoutHelpers.GetLayoutDescription(typeof(T));
var pSet = DrawElements <T> .Create(
geometry,
PrimitiveTopology.TriangleList,
(uint)geometry.IndexData.Length,
1,
0,
0,
0);
geometry.PrimitiveSets.Add(pSet);
}