public static CSG Sphere()
{
int slices = 16;
int stacks = 8;
List <CSGPolygon> polygons = new List <CSGPolygon>();
for (int i = 0; i < slices; i++)
{
for (int j = 0; j < stacks; j++)
{
List <CSGVertex> vertexList = new List <CSGVertex>();
vertexList.Add(AddVertex((double)i / (double)slices, (double)j / (double)stacks));
if (j > 0)
{
vertexList.Add(AddVertex((double)(i + 1) / (double)slices, (double)j / (double)stacks));
}
if (j < stacks - 1)
{
vertexList.Add(AddVertex((double)(i + 1) / (double)slices, (double)(j + 1) / (double)stacks));
}
vertexList.Add(AddVertex((double)i / (double)slices, (double)(j + 1) / (double)stacks));
polygons.Add(new CSGPolygon(vertexList, 0));
}
}
return(CSG.fromPolygons(polygons));
}
public static CSG Cylinder(CSGVector bottom, CSGVector top, int radius)
{
CylinderBottom = bottom;
CylinderTop = top;
CylinderRadius = radius;
ray = CylinderTop.minus(CylinderBottom);
int slices = 16;
axisZ = ray.unit();
int isY = Math.Abs(axisZ.y) > 0.5 ? 1 : 0;
axisX = new CSGVector(isY, 1 - isY, 0).cross(axisZ).unit();
axisY = axisX.cross(axisZ).unit();
CSGVertex start = new CSGVertex(CylinderBottom, axisZ.negated());
CSGVertex end = new CSGVertex(CylinderTop, axisZ.unit());
List <CSGPolygon> polygons = new List <CSGPolygon>();
for (int i = 0; i < slices; i++)
{
double t0 = (double)i / (double)slices;
double t1 = (double)(i + 1) / (double)slices;
polygons.Add(new CSGPolygon(start, point(0, t0, -1), point(0, t1, -1)));
polygons.Add(new CSGPolygon(point(0, t1, 0), point(0, t0, 0), point(1, t0, 0), point(1, t1, 0)));
polygons.Add(new CSGPolygon(end, point(1, t1, 1), point(1, t0, 1)));
}
return(CSG.fromPolygons(polygons));
}
public CSG clone()
{
CSG csg = new CSG();
foreach (CSGPolygon p in polygons)
{
csg.polygons.Add(p.clone());
}
return(csg);
}
public CSG union(CSG csg)
{
CSGNode a = new CSGNode(this.clone().polygons);
CSGNode b = new CSGNode(csg.clone().polygons);
a.clipTo(b);
b.clipTo(a);
b.invert();
b.clipTo(a);
b.invert();
a.build(b.allPolygons());
return(CSG.fromTriangles(a.allPolygons()));
}
public static CSG Cube(CSGVector center, int r1, int r2, int r3)
{
CubeCenter = center;
CubeDimension[0] = r1;
CubeDimension[1] = r2;
CubeDimension[2] = r3;
List <CubeMaker> cubemakerList = new List <CubeMaker>();
cubemakerList.Add(new CubeMaker(0, 4, 6, 2, -1, 0, 0));
cubemakerList.Add(new CubeMaker(1, 3, 7, 5, +1, 0, 0));
cubemakerList.Add(new CubeMaker(0, 1, 5, 4, 0, -1, 0));
cubemakerList.Add(new CubeMaker(2, 6, 7, 3, 0, +1, 0));
cubemakerList.Add(new CubeMaker(0, 2, 3, 1, 0, 0, -1));
cubemakerList.Add(new CubeMaker(4, 5, 7, 6, 0, 0, +1));
List <CSGPolygon> polygonList = new List <CSGPolygon>();
foreach (CubeMaker cm in cubemakerList)
{
List <CSGVertex> vertexList = new List <CSGVertex>();
for (int i = 0; i < 4; i++)
{
float x = CubeCenter.x + CubeDimension[0] * (2 * ((cm.param[i] & 1) != 0 ? 1 : 0) - 1);
float y = CubeCenter.y + CubeDimension[1] * (2 * ((cm.param[i] & 2) != 0 ? 1 : 0) - 1);
float z = CubeCenter.z + CubeDimension[2] * (2 * ((cm.param[i] & 4) != 0 ? 1 : 0) - 1);
CSGVector pos = new CSGVector(x, y, z);
CSGVector n = new CSGVector(cm.nx, cm.ny, cm.nz);
vertexList.Add(new CSGVertex(pos, n));
}
polygonList.Add(new CSGPolygon(vertexList, 0));
}
return(CSG.fromPolygons(polygonList));
}
public static CSG Cube(CSGVector center, int size)
{
return(CSG.Cube(center, size, size, size));
}
public static CSG Cube(CSGVector center)
{
return(CSG.Cube(center, 20));
}
public static CSG Cube(int size)
{
return(CSG.Cube(new CSGVector(0, 0, 0), size));
}
public static CSG Cube()
{
return(CSG.Cube(new CSGVector(0, 0, 0)));
}
public static CSG Cylinder(int height, int radius)
{
return(CSG.Cylinder(new CSGVector(0, 0, 0), new CSGVector(0, height, 0), radius));
}
public static CSG Cylinder()
{
return(CSG.Cylinder(30, 20));
}