// Create a new vertex between this vertex and `other` by linearly
// interpolating all properties using a parameter of `t`. Subclasses should
// override this to interpolate additional properties.
public static csgjs_vertex interpolate(csgjs_vertex a, csgjs_vertex b, float t)
{
csgjs_vertex ret = new csgjs_vertex();
ret.pos = csgjs_vector.lerp(a.pos, b.pos, t);
ret.normal = csgjs_vector.lerp(a.normal, b.normal, t);
ret.uv = csgjs_vector.lerp(a.uv, b.uv, t);
return ret;
}
public csgjs_vertex clone()
{
csgjs_vertex c = new csgjs_vertex();
c.pos = pos.clone();
c.normal = normal.clone();
c.uv = uv.clone();
return c;
}
// Create a new vertex between this vertex and `other` by linearly
// interpolating all properties using a parameter of `t`. Subclasses should
// override this to interpolate additional properties.
public static csgjs_vertex interpolate(csgjs_vertex a, csgjs_vertex b, float t)
{
csgjs_vertex ret = new csgjs_vertex();
ret.pos = csgjs_vector.lerp(a.pos, b.pos, t);
ret.normal = csgjs_vector.lerp(a.normal, b.normal, t);
ret.uv = csgjs_vector.lerp(a.uv, b.uv, t);
return(ret);
}
public csgjs_vertex clone()
{
csgjs_vertex c = new csgjs_vertex();
c.pos = pos.clone();
c.normal = normal.clone();
c.uv = uv.clone();
return(c);
}
public static List <csgjs_polygon> csgjs_modelToPolygons(csgjs_model model)
{
List <csgjs_polygon> list = new List <csgjs_polygon>();
for (int i = 0; i < model.indices.Count; i += 3)
{
List <csgjs_vertex> triangle = new List <csgjs_vertex>();
for (int j = 0; j < 3; j++)
{
csgjs_vertex v = model.vertices[model.indices[i + j]];
triangle.Add(v); //.push_back(v);
}
//list.push_back(csgjs_polygon(triangle));
list.Add(new csgjs_polygon(triangle));
}
return(list);
}
// Split `polygon` by this plane if needed, then put the polygon or polygon
// fragments in the appropriate lists. Coplanar polygons go into either
// `coplanarFront` or `coplanarBack` depending on their orientation with
// respect to this plane. Polygons in front or in back of this plane go into
// either `front` or `back`.
public void splitPolygon(csgjs_polygon polygon, List <csgjs_polygon> coplanarFront, List <csgjs_polygon> coplanarBack, ref List <csgjs_polygon> front, ref List <csgjs_polygon> back)
{
// Classify each point as well as the entire polygon into one of the above
// four classes.
int polygonType = 0;
List <int> types = new List <int>();
for (int i = 0; i < polygon.vertices.Count; i++)
{
float t = csgjs_vector.dot(normal, polygon.vertices[i].pos) - w;
int type = (t < -CSG.csgjs_EPSILON) ? BACK : ((t > CSG.csgjs_EPSILON) ? FRONT : COPLANAR);
polygonType |= type;
types.Add(type);
}
// Put the polygon in the correct list, splitting it when necessary.
switch (polygonType)
{
case COPLANAR:
{
if (csgjs_vector.dot(normal, polygon.plane.normal) > 0)
{
coplanarFront.Add(polygon);
}
else
{
coplanarBack.Add(polygon);
}
break;
}
case FRONT:
{
front.Add(polygon);
break;
}
case BACK:
{
back.Add(polygon);
break;
}
case SPANNING:
{
List <csgjs_vertex> f = new List <csgjs_vertex>();
List <csgjs_vertex> b = new List <csgjs_vertex>();
for (int i = 0; i < polygon.vertices.Count; i++)
{
int j = (i + 1) % polygon.vertices.Count;
int ti = types[i], tj = types[j];
csgjs_vertex vi = polygon.vertices[i], vj = polygon.vertices[j];
if (ti != BACK)
{
f.Add(vi);
}
if (ti != FRONT)
{
b.Add(vi);
}
if ((ti | tj) == SPANNING)
{
float t = (w - csgjs_vector.dot(normal, vi.pos)) / csgjs_vector.dot(normal, vj.pos - vi.pos);
csgjs_vertex v = csgjs_vertex.interpolate(vi, vj, t);
f.Add(v);
b.Add(v);
}
}
if (f.Count >= 3)
{
front.Add(new csgjs_polygon(f));
}
if (b.Count >= 3)
{
back.Add(new csgjs_polygon(b));
}
break;
}
}
}
// Invert all orientation-specific data (e.g. vertex normal). Called when the
// orientation of a polygon is flipped.
public static csgjs_vertex flip(csgjs_vertex v)
{
v.normal = csgjs_vector.negate(v.normal);
return(v);
}
// Invert all orientation-specific data (e.g. vertex normal). Called when the
// orientation of a polygon is flipped.
public static csgjs_vertex flip(csgjs_vertex v)
{
v.normal = csgjs_vector.negate(v.normal);
return v;
}