public static bool GenerateRevolvedShapeAsset(CSGBrushMeshAsset brushMeshAsset, CSGRevolvedShapeDefinition definition)
{
definition.Validate();
var surfaces = definition.surfaceAssets;
var descriptions = definition.surfaceDescriptions;
var shapeVertices = new List <Vector2>();
var shapeSegmentIndices = new List <int>();
GetPathVertices(definition.shape, definition.curveSegments, shapeVertices, shapeSegmentIndices);
Vector2[][] polygonVerticesArray;
int[][] polygonIndicesArray;
if (!Decomposition.ConvexPartition(shapeVertices, shapeSegmentIndices,
out polygonVerticesArray,
out polygonIndicesArray))
{
brushMeshAsset.Clear();
return(false);
}
// TODO: splitting it before we do the composition would be better
var polygonVerticesList = polygonVerticesArray.ToList();
for (int i = polygonVerticesList.Count - 1; i >= 0; i--)
{
SplitPolygon(polygonVerticesList, i);
}
var subMeshes = new List <CSGBrushSubMesh>();
var horzSegments = definition.revolveSegments; //horizontalSegments;
var horzDegreePerSegment = definition.totalAngle / horzSegments;
// TODO: make this work when intersecting rotation axis
// 1. split polygons along rotation axis
// 2. if edge lies on rotation axis, make sure we don't create infinitely thin quad
// collapse this quad, or prevent this from happening
// TODO: share this code with torus generator
for (int p = 0; p < polygonVerticesList.Count; p++)
{
var polygonVertices = polygonVerticesList[p];
// var segmentIndices = polygonIndicesArray[p];
var shapeSegments = polygonVertices.Length;
var vertSegments = polygonVertices.Length;
var descriptionIndex = new int[2 + vertSegments];
descriptionIndex[0] = 0;
descriptionIndex[1] = 1;
for (int v = 0; v < vertSegments; v++)
{
descriptionIndex[v + 2] = 2;
}
var horzOffset = definition.startAngle;
for (int h = 1, pr = 0; h < horzSegments + 1; pr = h, h++)
{
var hDegree0 = (pr * horzDegreePerSegment) + horzOffset;
var hDegree1 = (h * horzDegreePerSegment) + horzOffset;
var rotation0 = Quaternion.AngleAxis(hDegree0, Vector3.forward);
var rotation1 = Quaternion.AngleAxis(hDegree1, Vector3.forward);
var subMeshVertices = new Vector3[vertSegments * 2];
for (int v = 0; v < vertSegments; v++)
{
subMeshVertices[v + vertSegments] = rotation0 * new Vector3(polygonVertices[v].x, 0, polygonVertices[v].y);
subMeshVertices[v] = rotation1 * new Vector3(polygonVertices[v].x, 0, polygonVertices[v].y);
}
var subMesh = new CSGBrushSubMesh();
if (!CreateExtrudedSubMesh(subMesh, vertSegments, descriptionIndex, descriptionIndex, 0, 1, subMeshVertices, surfaces, descriptions))
{
continue;
}
if (!subMesh.Validate())
{
brushMeshAsset.Clear();
return(false);
}
subMeshes.Add(subMesh);
}
}
brushMeshAsset.SubMeshes = subMeshes.ToArray();
brushMeshAsset.CalculatePlanes();
brushMeshAsset.SetDirty();
return(true);
}