static bool CreateExtrudedSubMesh(CSGBrushSubMesh subMesh, int segments, int[] segmentDescriptionIndices, int[] segmentAssetIndices, int segmentTopIndex, int segmentBottomIndex, Vector3[] vertices, CSGSurfaceAsset[] surfaceAssets, SurfaceDescription[] surfaceDescriptions)
{
if (vertices.Length < 3)
{
return(false);
}
// TODO: vertex reverse winding when it's not clockwise
// TODO: handle duplicate vertices, remove them or avoid them being created in the first place (maybe use indices?)
var segmentTopology = new SegmentTopology[segments];
var edgeIndices = new int[segments * 2];
var polygonCount = 2;
var edgeOffset = segments + segments;
for (int p = segments - 2, e = segments - 1, n = 0; n < segments; p = e, e = n, n++)
{
// t0
// ------> -------> ----->
// v0 * * v1
// <----- <------- <-----
// ^ | e2 ^ |
// | | | |
// q1 p0| |e3 q2 e5| |n0 q3
// | | | |
// | v e4 | v
// ------> -------> ----->
// v3 * * v2
// <----- <------- <-----
// b0
//
var v0 = vertices[p];
var v1 = vertices[e];
var v2 = vertices[e + segments];
var v3 = vertices[p + segments];
var equals03 = (v0 - v3).sqrMagnitude < 0.0001f;
var equals12 = (v1 - v2).sqrMagnitude < 0.0001f;
if (equals03)
{
if (equals12)
{
segmentTopology[n] = SegmentTopology.None;
}
else
{
segmentTopology[n] = SegmentTopology.TriangleNegative;
}
}
else
if (equals12)
{
segmentTopology[n] = SegmentTopology.TrianglePositive;
}
else
{
var plane = new Plane(v0, v1, v3);
var dist = plane.GetDistanceToPoint(v2);
if (UnityEngine.Mathf.Abs(dist) < 0.001f)
{
segmentTopology[n] = SegmentTopology.Quad;
}
else
{
segmentTopology[n] = (SegmentTopology)UnityEngine.Mathf.Sign(dist);
}
}
switch (segmentTopology[n])
{
case SegmentTopology.Quad:
{
edgeIndices[(n * 2) + 0] = edgeOffset + 1;
polygonCount++;
edgeOffset += 4;
edgeIndices[(n * 2) + 1] = edgeOffset - 1;
break;
}
case SegmentTopology.TrianglesNegative:
case SegmentTopology.TrianglesPositive:
{
edgeIndices[(n * 2) + 0] = edgeOffset + 1;
polygonCount += 2;
edgeOffset += 6;
edgeIndices[(n * 2) + 1] = edgeOffset - 1;
break;
}
case SegmentTopology.TriangleNegative:
case SegmentTopology.TrianglePositive:
{
edgeIndices[(n * 2) + 0] = edgeOffset + 1;
polygonCount++;
edgeOffset += 3;
edgeIndices[(n * 2) + 1] = edgeOffset - 1;
break;
}
case SegmentTopology.None:
edgeIndices[(n * 2) + 0] = 0;
edgeIndices[(n * 2) + 1] = 0;
break;
}
}
var polygons = new CSGBrushSubMesh.Polygon[polygonCount];
var surfaceDescription0 = surfaceDescriptions[segmentTopIndex];
var surfaceDescription1 = surfaceDescriptions[segmentBottomIndex];
var surfaceAsset0 = surfaceAssets[segmentTopIndex];
var surfaceAsset1 = surfaceAssets[segmentBottomIndex];
polygons[0] = new CSGBrushSubMesh.Polygon {
surfaceID = 0, firstEdge = 0, edgeCount = segments, description = surfaceDescription0, surfaceAsset = surfaceAsset0
};
polygons[1] = new CSGBrushSubMesh.Polygon {
surfaceID = 1, firstEdge = segments, edgeCount = segments, description = surfaceDescription1, surfaceAsset = surfaceAsset1
};
for (int s = 0, surfaceID = 2; s < segments; s++)
{
var descriptionIndex = (segmentDescriptionIndices == null) ? s + 2 : (segmentDescriptionIndices[s]);
var assetIndex = (segmentAssetIndices == null) ? 2 : (segmentAssetIndices[s]);
var firstEdge = edgeIndices[(s * 2) + 0] - 1;
switch (segmentTopology[s])
{
case SegmentTopology.Quad:
{
polygons[surfaceID] = new CSGBrushSubMesh.Polygon {
surfaceID = surfaceID, firstEdge = firstEdge, edgeCount = 4, description = surfaceDescriptions[descriptionIndex], surfaceAsset = surfaceAssets[assetIndex]
};
polygons[surfaceID].description.smoothingGroup = (uint)0;
surfaceID++;
break;
}
case SegmentTopology.TrianglesNegative:
case SegmentTopology.TrianglesPositive:
{
var smoothingGroup = surfaceID + 1; // TODO: create an unique smoothing group for faceted surfaces that are split in two,
// unless there's already a smoothing group for this edge; then use that
polygons[surfaceID + 0] = new CSGBrushSubMesh.Polygon {
surfaceID = surfaceID + 0, firstEdge = firstEdge, edgeCount = 3, description = surfaceDescriptions[descriptionIndex], surfaceAsset = surfaceAssets[assetIndex]
};
polygons[surfaceID + 0].description.smoothingGroup = (uint)smoothingGroup;
polygons[surfaceID + 1] = new CSGBrushSubMesh.Polygon {
surfaceID = surfaceID + 1, firstEdge = firstEdge + 3, edgeCount = 3, description = surfaceDescriptions[descriptionIndex], surfaceAsset = surfaceAssets[assetIndex]
};
polygons[surfaceID + 1].description.smoothingGroup = (uint)smoothingGroup;
surfaceID += 2;
break;
}
case SegmentTopology.TriangleNegative:
case SegmentTopology.TrianglePositive:
{
polygons[surfaceID] = new CSGBrushSubMesh.Polygon {
surfaceID = surfaceID, firstEdge = firstEdge, edgeCount = 3, description = surfaceDescriptions[descriptionIndex], surfaceAsset = surfaceAssets[assetIndex]
};
polygons[surfaceID].description.smoothingGroup = (uint)0;
surfaceID++;
break;
}
case SegmentTopology.None:
{
break;
}
}
}
var halfEdges = new BrushMesh.HalfEdge[edgeOffset];
for (int p = segments - 2, e = segments - 1, n = 0; n < segments; p = e, e = n, n++)
{
//var vi0 = p;
var vi1 = e;
var vi2 = e + segments;
var vi3 = p + segments;
var t0 = e;
var b0 = ((segments - 1) - e) + segments;
switch (segmentTopology[n])
{
case SegmentTopology.None:
{
halfEdges[t0] = new BrushMesh.HalfEdge {
vertexIndex = vi2, twinIndex = b0
};
halfEdges[b0] = new BrushMesh.HalfEdge {
vertexIndex = vi3, twinIndex = t0
};
break;
}
case SegmentTopology.TrianglePositive:
{
halfEdges[t0] = new BrushMesh.HalfEdge {
vertexIndex = vi2, twinIndex = -1
};
halfEdges[b0] = new BrushMesh.HalfEdge {
vertexIndex = vi3, twinIndex = -1
};
break;
}
case SegmentTopology.TriangleNegative:
default:
{
halfEdges[t0] = new BrushMesh.HalfEdge {
vertexIndex = vi1, twinIndex = -1
};
halfEdges[b0] = new BrushMesh.HalfEdge {
vertexIndex = vi3, twinIndex = -1
};
break;
}
}
}
for (int p = segments - 2, e = segments - 1, n = 0; n < segments; p = e, e = n, n++)
{
var vi0 = p;
var vi1 = e;
var vi2 = e + segments;
var vi3 = p + segments;
var t0 = e;
var b0 = ((segments - 1) - e) + segments;
var nn = (n + 1) % segments;
var p0 = edgeIndices[(e * 2) + 1];
var n0 = edgeIndices[(nn * 2) + 0];
switch (segmentTopology[n])
{
case SegmentTopology.None:
{
continue;
}
case SegmentTopology.Quad:
{
// t0
// ------> -------> ----->
// v0 * * v1
// <----- <------- <-----
// ^ | e2 ^ |
// | | | |
// q1 p0| |e3 q2 e5| |n0 q3
// | | | |
// | v e4 | v
// ------> -------> ----->
// v3 * * v2
// <----- <------- <-----
// b0
//
var q2 = edgeIndices[(n * 2) + 0];
var e2 = q2 - 1;
var e3 = q2 + 0;
var e4 = q2 + 1;
var e5 = q2 + 2;
halfEdges[t0].twinIndex = e2;
halfEdges[b0].twinIndex = e4;
halfEdges[e2] = new BrushMesh.HalfEdge {
vertexIndex = vi0, twinIndex = t0
};
halfEdges[e3] = new BrushMesh.HalfEdge {
vertexIndex = vi3, twinIndex = p0
};
halfEdges[e4] = new BrushMesh.HalfEdge {
vertexIndex = vi2, twinIndex = b0
};
halfEdges[e5] = new BrushMesh.HalfEdge {
vertexIndex = vi1, twinIndex = n0
};
break;
}
case SegmentTopology.TrianglesNegative:
{
// t0
// ------> -----------> ----->
// v0 * * v1
// <----- <----------- <-----
// ^ | e2 ^ ^ |
// | | / / | |
// | | e4/ / | |
// q1 p0| |e3 / / e7| |n0 q3
// | | / /e5 | |
// | | / / | |
// | v/v e6 | v
// ------> -----------> ----->
// v3 * * v2
// <----- <----------- <-----
// b0
//
var q2 = edgeIndices[(n * 2) + 0];
var e2 = q2 - 1;
var e3 = q2 + 0;
var e4 = q2 + 1;
var e5 = q2 + 2;
var e6 = q2 + 3;
var e7 = q2 + 4;
halfEdges[t0].twinIndex = e2;
halfEdges[b0].twinIndex = e6;
halfEdges[e2] = new BrushMesh.HalfEdge {
vertexIndex = vi0, twinIndex = t0
};
halfEdges[e3] = new BrushMesh.HalfEdge {
vertexIndex = vi3, twinIndex = p0
};
halfEdges[e4] = new BrushMesh.HalfEdge {
vertexIndex = vi1, twinIndex = e5
};
halfEdges[e5] = new BrushMesh.HalfEdge {
vertexIndex = vi3, twinIndex = e4
};
halfEdges[e6] = new BrushMesh.HalfEdge {
vertexIndex = vi2, twinIndex = b0
};
halfEdges[e7] = new BrushMesh.HalfEdge {
vertexIndex = vi1, twinIndex = n0
};
break;
}
case SegmentTopology.TrianglesPositive:
{
// t0
// ------> -----------> ----->
// v0 * * v1
// <----- <----------- <-----
// ^ |^\ e5 ^ |
// | | \ \ | |
// | | \ \ e6 | |
// q1 p0| |e3 e2\ \ e7| |n0 q3
// | | \ \ | |
// | | \ \ | |
// | v e4 \ v| v
// ------> -----------> ----->
// v3 * * v2
// <----- <----------- <-----
// b0
//
var q2 = edgeIndices[(n * 2) + 0];
var e2 = q2 - 1;
var e3 = q2 + 0;
var e4 = q2 + 1;
var e5 = q2 + 2;
var e6 = q2 + 3;
var e7 = q2 + 4;
halfEdges[t0].twinIndex = e5;
halfEdges[b0].twinIndex = e4;
halfEdges[e2] = new BrushMesh.HalfEdge {
vertexIndex = vi0, twinIndex = e6
};
halfEdges[e3] = new BrushMesh.HalfEdge {
vertexIndex = vi3, twinIndex = p0
};
halfEdges[e4] = new BrushMesh.HalfEdge {
vertexIndex = vi2, twinIndex = b0
};
halfEdges[e5] = new BrushMesh.HalfEdge {
vertexIndex = vi0, twinIndex = t0
};
halfEdges[e6] = new BrushMesh.HalfEdge {
vertexIndex = vi2, twinIndex = e2
};
halfEdges[e7] = new BrushMesh.HalfEdge {
vertexIndex = vi1, twinIndex = n0
};
break;
}
case SegmentTopology.TriangleNegative:
{
// t0
// ---> ------->
// \ ^ * v1
// <--- \ / ^ <-----
// \ \ / / | |
// \ \ / / | |
// \ \ t0 / / | |
// \ \ / /e2 | | n0
// \ \ / / | |
// \ \ / / q2 e4| | q3
// \ \ / / | |
// v \/ v e3 | v
// ------------> -------> ----->
// v3 * * v2
// <----------- <------- <-----
// b0
//
var q2 = edgeIndices[(n * 2) + 0];
var e2 = q2 - 1;
var e3 = q2 + 0;
var e4 = q2 + 1;
halfEdges[t0].twinIndex = e2;
halfEdges[b0].twinIndex = e3;
// vi0 / vi3
halfEdges[e2] = new BrushMesh.HalfEdge {
vertexIndex = vi3, twinIndex = t0
};
halfEdges[e3] = new BrushMesh.HalfEdge {
vertexIndex = vi2, twinIndex = b0
};
halfEdges[e4] = new BrushMesh.HalfEdge {
vertexIndex = vi1, twinIndex = n0
};
break;
}
case SegmentTopology.TrianglePositive:
{
//
// -------> ---->
// v0 * \ ^
// <----- \ / <---
// ^ |^ \ / /
// | | \ \ / /
// | | \ \ / /
// | | \ \ t0 / /
// q1 | | e2 \ \ / /
// | | \ \ / /
// p0| |e3 \ \ / /
// | | q2 \ \ / /
// | | \ \ / /
// | v e4 \ v / v
// ------> -----------> ----->
// v3 * * v2
// <----- <----------- <-----
// b0
//
var q2 = edgeIndices[(n * 2) + 0];
var e2 = q2 - 1;
var e3 = q2 + 0;
var e4 = q2 + 1;
halfEdges[t0].twinIndex = e2;
halfEdges[b0].twinIndex = e4;
halfEdges[e2] = new BrushMesh.HalfEdge {
vertexIndex = vi0, twinIndex = t0
};
halfEdges[e3] = new BrushMesh.HalfEdge {
vertexIndex = vi3, twinIndex = p0
};
// vi1 / vi2
halfEdges[e4] = new BrushMesh.HalfEdge {
vertexIndex = vi2, twinIndex = b0
};
break;
}
}
}
subMesh.Polygons = polygons;
subMesh.HalfEdges = halfEdges;
subMesh.Vertices = vertices;
subMesh.CreateOrUpdateBrushMesh();
return(true);
}
static void CreateExtrudedSubMesh(CSGBrushSubMesh subMesh, Vector3[] sideVertices, Vector3 extrusion, int[] segmentDescriptionIndices, int[] segmentAssetIndices, CSGSurfaceAsset[] surfaceAssets, SurfaceDescription[] surfaceDescriptions)
{
const float distanceEpsilon = 0.0000001f;
for (int i = sideVertices.Length - 1; i >= 0; i--)
{
var j = (i - 1 + sideVertices.Length) % sideVertices.Length;
var magnitude = (sideVertices[j] - sideVertices[i]).sqrMagnitude;
if (magnitude < distanceEpsilon)
{
// TODO: improve on this
var tmp = sideVertices.ToList();
tmp.RemoveAt(i);
sideVertices = tmp.ToArray();
}
}
var segments = sideVertices.Length;
var isSegmentConvex = new sbyte[segments];
var edgeIndices = new int[segments * 2];
var vertices = new Vector3[segments * 2];
var polygonCount = 2;
var edgeOffset = segments + segments;
for (int p = segments - 2, e = segments - 1, n = 0; n < segments; p = e, e = n, n++)
{
// t0
// ------> -------> ----->
// v0 * * v1
// <----- <------- <-----
// ^ | e2 ^ |
// | | | |
// q1 p0| |e3 q2 e5| |n0 q3
// | | | |
// | v e4 | v
// ------> -------> ----->
// v3 * * v2
// <----- <------- <-----
// b0
//
var v0 = sideVertices[p];
var v1 = sideVertices[e];
var v2 = sideVertices[e] + extrusion;
var v3 = sideVertices[p] + extrusion;
vertices[p] = v0;
vertices[e] = v1;
vertices[e + segments] = v2;
vertices[p + segments] = v3;
var plane = new Plane(v0, v1, v3);
var dist = plane.GetDistanceToPoint(v2);
if (UnityEngine.Mathf.Abs(dist) < 0.001f)
{
isSegmentConvex[n] = 0;
}
else
{
isSegmentConvex[n] = (sbyte)UnityEngine.Mathf.Sign(dist);
}
edgeIndices[(n * 2) + 0] = edgeOffset + 1;
if (isSegmentConvex[n] == 0)
{
polygonCount++;
edgeOffset += 4;
}
else
{
polygonCount += 2;
edgeOffset += 6;
}
edgeIndices[(n * 2) + 1] = edgeOffset - 1;
}
var polygons = new CSGBrushSubMesh.Polygon[polygonCount];
var descriptionIndex0 = (segmentDescriptionIndices == null) ? 0 : (segmentDescriptionIndices[0]);
var descriptionIndex1 = (segmentDescriptionIndices == null) ? 1 : (segmentDescriptionIndices[1]);
var assetIndex0 = (segmentAssetIndices == null) ? 0 : (segmentAssetIndices[0]);
var assetIndex1 = (segmentAssetIndices == null) ? 1 : (segmentAssetIndices[1]);
var surfaceDescription0 = surfaceDescriptions[descriptionIndex0];
var surfaceDescription1 = surfaceDescriptions[descriptionIndex1];
var surfaceAsset0 = surfaceAssets[assetIndex0];
var surfaceAsset1 = surfaceAssets[assetIndex1];
polygons[0] = new CSGBrushSubMesh.Polygon {
surfaceID = 0, firstEdge = 0, edgeCount = segments, description = surfaceDescription0, surfaceAsset = surfaceAsset0
};
polygons[1] = new CSGBrushSubMesh.Polygon {
surfaceID = 1, firstEdge = segments, edgeCount = segments, description = surfaceDescription1, surfaceAsset = surfaceAsset1
};
for (int s = 0, surfaceID = 2; s < segments; s++)
{
var descriptionIndex = (segmentDescriptionIndices == null) ? s + 2 : (segmentDescriptionIndices[s + 2]);
var assetIndex = (segmentAssetIndices == null) ? 2 : (segmentAssetIndices[s + 2]);
var firstEdge = edgeIndices[(s * 2) + 0] - 1;
if (isSegmentConvex[s] == 0)
{
polygons[surfaceID] = new CSGBrushSubMesh.Polygon {
surfaceID = surfaceID, firstEdge = firstEdge, edgeCount = 4, description = surfaceDescriptions[descriptionIndex], surfaceAsset = surfaceAssets[assetIndex]
};
polygons[surfaceID].description.smoothingGroup = (uint)0;
surfaceID++;
}
else
{
var smoothingGroup = surfaceID + 1; // TODO: create an unique smoothing group for faceted surfaces that are split in two,
// unless there's already a smoothing group for this edge; then use that
polygons[surfaceID + 0] = new CSGBrushSubMesh.Polygon {
surfaceID = surfaceID + 0, firstEdge = firstEdge, edgeCount = 3, description = surfaceDescriptions[descriptionIndex], surfaceAsset = surfaceAssets[assetIndex]
};
polygons[surfaceID + 0].description.smoothingGroup = (uint)smoothingGroup;
polygons[surfaceID + 1] = new CSGBrushSubMesh.Polygon {
surfaceID = surfaceID + 1, firstEdge = firstEdge + 3, edgeCount = 3, description = surfaceDescriptions[descriptionIndex], surfaceAsset = surfaceAssets[assetIndex]
};
polygons[surfaceID + 1].description.smoothingGroup = (uint)smoothingGroup;
surfaceID += 2;
}
}
var halfEdges = new BrushMesh.HalfEdge[edgeOffset];
for (int p = segments - 2, e = segments - 1, n = 0; n < segments; p = e, e = n, n++)
{
var vi1 = e;
var vi3 = p + segments;
var t0 = e;
var b0 = ((segments - 1) - e) + segments;
halfEdges[t0] = new BrushMesh.HalfEdge {
vertexIndex = vi1, twinIndex = -1
};
halfEdges[b0] = new BrushMesh.HalfEdge {
vertexIndex = vi3, twinIndex = -1
};
}
for (int p = segments - 2, e = segments - 1, n = 0; n < segments; p = e, e = n, n++)
{
var vi0 = p;
var vi1 = e;
var vi2 = e + segments;
var vi3 = p + segments;
var t0 = e;
var b0 = ((segments - 1) - e) + segments;
var p0 = edgeIndices[(p * 2) + 1];
var n0 = edgeIndices[(n * 2) + 0];
if (isSegmentConvex[e] == 0)
{
// t0
// ------> -------> ----->
// v0 * * v1
// <----- <------- <-----
// ^ | e2 ^ |
// | | | |
// q1 p0| |e3 q2 e5| |n0 q3
// | | | |
// | v e4 | v
// ------> -------> ----->
// v3 * * v2
// <----- <------- <-----
// b0
//
var q2 = edgeIndices[(e * 2) + 0];
var e2 = q2 - 1;
var e3 = q2 + 0;
var e4 = q2 + 1;
var e5 = q2 + 2;
halfEdges[t0].twinIndex = e2;
halfEdges[b0].twinIndex = e4;
halfEdges[e2] = new BrushMesh.HalfEdge {
vertexIndex = vi0, twinIndex = t0
};
halfEdges[e3] = new BrushMesh.HalfEdge {
vertexIndex = vi3, twinIndex = p0
};
halfEdges[e4] = new BrushMesh.HalfEdge {
vertexIndex = vi2, twinIndex = b0
};
halfEdges[e5] = new BrushMesh.HalfEdge {
vertexIndex = vi1, twinIndex = n0
};
}
else
if (isSegmentConvex[e] == -1)
{
// t0
// ------> -----------> ----->
// v0 * * v1
// <----- <----------- <-----
// ^ | e2 ^ ^ |
// | | / / | |
// | | e4/ / | |
// q1 p0| |e3 / / e7| |n0 q3
// | | / /e5 | |
// | | / / | |
// | v/v e6 | v
// ------> -----------> ----->
// v3 * * v2
// <----- <----------- <-----
// b0
//
var q2 = edgeIndices[(e * 2) + 0];
var e2 = q2 - 1;
var e3 = q2 + 0;
var e4 = q2 + 1;
var e5 = q2 + 2;
var e6 = q2 + 3;
var e7 = q2 + 4;
halfEdges[t0].twinIndex = e2;
halfEdges[b0].twinIndex = e6;
halfEdges[e2] = new BrushMesh.HalfEdge {
vertexIndex = vi0, twinIndex = t0
};
halfEdges[e3] = new BrushMesh.HalfEdge {
vertexIndex = vi3, twinIndex = p0
};
halfEdges[e4] = new BrushMesh.HalfEdge {
vertexIndex = vi1, twinIndex = e5
};
halfEdges[e5] = new BrushMesh.HalfEdge {
vertexIndex = vi3, twinIndex = e4
};
halfEdges[e6] = new BrushMesh.HalfEdge {
vertexIndex = vi2, twinIndex = b0
};
halfEdges[e7] = new BrushMesh.HalfEdge {
vertexIndex = vi1, twinIndex = n0
};
}
else
if (isSegmentConvex[e] == 1)
{
// t0
// ------> -----------> ----->
// v0 * * v1
// <----- <----------- <-----
// ^ |^\ e5 ^ |
// | | \ \ | |
// | | \ \ e6 | |
// q1 p0| |e3 e2\ \ e7| |n0 q3
// | | \ \ | |
// | | \ \ | |
// | v e4 \ v| v
// ------> -----------> ----->
// v3 * * v2
// <----- <----------- <-----
// b0
//
var q2 = edgeIndices[(e * 2) + 0];
var e2 = q2 - 1;
var e3 = q2 + 0;
var e4 = q2 + 1;
var e5 = q2 + 2;
var e6 = q2 + 3;
var e7 = q2 + 4;
halfEdges[t0].twinIndex = e5;
halfEdges[b0].twinIndex = e4;
halfEdges[e2] = new BrushMesh.HalfEdge {
vertexIndex = vi0, twinIndex = e6
};
halfEdges[e3] = new BrushMesh.HalfEdge {
vertexIndex = vi3, twinIndex = p0
};
halfEdges[e4] = new BrushMesh.HalfEdge {
vertexIndex = vi2, twinIndex = b0
};
halfEdges[e5] = new BrushMesh.HalfEdge {
vertexIndex = vi0, twinIndex = t0
};
halfEdges[e6] = new BrushMesh.HalfEdge {
vertexIndex = vi2, twinIndex = e2
};
halfEdges[e7] = new BrushMesh.HalfEdge {
vertexIndex = vi1, twinIndex = n0
};
}
}
subMesh.Polygons = polygons;
subMesh.HalfEdges = halfEdges;
subMesh.Vertices = vertices;
subMesh.CreateOrUpdateBrushMesh();
}
static void CreateConeSubMesh(CSGBrushSubMesh subMesh, int segments, int[] segmentDescriptionIndices, int[] segmentAssetIndices, Vector3[] vertices, CSGSurfaceAsset[] surfaceAssets, SurfaceDescription[] surfaceDescriptions)
{
var surfaceDescription0 = surfaceDescriptions[0];
var surfaceAsset0 = surfaceAssets[0];
var polygons = new CSGBrushSubMesh.Polygon[segments + 1];
polygons[0] = new CSGBrushSubMesh.Polygon {
surfaceID = 0, firstEdge = 0, edgeCount = segments, description = surfaceDescription0, surfaceAsset = surfaceAsset0
};
for (int s = 0, surfaceID = 1; s < segments; s++)
{
var descriptionIndex = (segmentDescriptionIndices == null) ? s + 2 : (segmentDescriptionIndices[s + 2]);
var assetIndex = (segmentAssetIndices == null) ? 2 : (segmentAssetIndices [s + 2]);
polygons[surfaceID] = new CSGBrushSubMesh.Polygon {
surfaceID = surfaceID, firstEdge = segments + (s * 3), edgeCount = 3, description = surfaceDescriptions[descriptionIndex], surfaceAsset = surfaceAssets[assetIndex]
};
polygons[surfaceID].description.smoothingGroup = (uint)0;
surfaceID++;
}
var halfEdges = new BrushMesh.HalfEdge[4 * segments];
for (int n = 0, e = segments - 1; n < segments; e = n, n++)
{
var p = (n + 1) % segments; // TODO: optimize away
// v0
// *
// ^ /^ \
// / / \ \
// / / e2 \ \
// / / \ \
// t2 / /e3 q2 e2\ \ t3
// / / \ \
// / v e1 \ v
// ------> -----------> ----->
// v2 * * v1
// <----- <---------- <-----
// e0
var v0 = 0;
var v1 = n + 1;
var v2 = e + 1;
var e0 = n;
var e1 = ((n * 3) + segments) + 0;
var e2 = ((n * 3) + segments) + 1;
var e3 = ((n * 3) + segments) + 2;
var t3 = ((e * 3) + segments) + 2;
var t2 = ((p * 3) + segments) + 1;
// bottom polygon
halfEdges[e0] = new BrushMesh.HalfEdge {
vertexIndex = v1, twinIndex = e1
};
// triangle
halfEdges[e1] = new BrushMesh.HalfEdge {
vertexIndex = v2, twinIndex = e0
};
halfEdges[e2] = new BrushMesh.HalfEdge {
vertexIndex = v0, twinIndex = t3
};
halfEdges[e3] = new BrushMesh.HalfEdge {
vertexIndex = v1, twinIndex = t2
};
}
subMesh.Polygons = polygons;
subMesh.HalfEdges = halfEdges;
subMesh.Vertices = vertices;
subMesh.CreateOrUpdateBrushMesh();
}