def DisplacementUVSphere(radius,
heightmap,
scale,
rings=5,
sectors=5,
inv_texture_u=False,
inv_texture_v=True):
data = EggData()
pool = EggVertexPool('pool')
vertices = []
data.addChild(pool)
R = 1. / (rings)
S = 1. / (sectors)
for r in range(0, rings + 1):
for s in range(0, sectors + 1):
cos_s = cos(2 * pi * s * S + pi)
sin_s = sin(2 * pi * s * S + pi)
sin_r = sin(pi * r * R)
cos_r = cos(pi * r * R)
x = cos_s * sin_r
y = sin_s * sin_r
z = cos_r
vertex = EggVertex()
u = s * S
v = r * R
height = radius + heightmap.get_height_uv(u, v) * scale
vertex.setPos(LPoint3d(x * height, y * height, z * height))
if inv_texture_v:
v = 1.0 - v
if inv_texture_u:
u = 1.0 - u
vertex.setUv(LPoint2d(u, v))
pool.addVertex(vertex)
vertices.append(vertex)
index = 0
for r in range(0, rings):
for s in range(0, sectors):
poly = EggPolygon()
data.addChild(poly)
poly.addVertex(vertices[index + sectors + 1])
poly.addVertex(vertices[index])
poly.addVertex(vertices[index + sectors])
poly = EggPolygon()
data.addChild(poly)
poly.addVertex(vertices[index + sectors + 1])
poly.addVertex(vertices[index + 1])
poly.addVertex(vertices[index])
index += 1
data.removeUnusedVertices(True)
data.recomputeVertexNormals(45)
data.recomputeTangentBinormal(GlobPattern(""))
node = loadEggData(data)
path = NodePath(node)
path.flattenStrong()
return path
def __eggifyverts(self, eprim, evpool, vlist):
for vertex in vlist:
ixyz = vertex['v']
vinfo = self.points[ixyz - 1]
vxyz, _ = vinfo
ev = EggVertex()
ev.setPos(Point3D(vxyz[0], vxyz[1], vxyz[2]))
iuv = vertex['vt']
if iuv is not None:
vuv = self.uvs[iuv - 1]
ev.setUv(Point2D(vuv[0], vuv[1]))
inormal = vertex['vn']
if inormal is not None:
vn = self.normals[inormal - 1]
ev.setNormal(Vec3D(vn[0], vn[1], vn[2]))
evpool.addVertex(ev)
eprim.addVertex(ev)
return self
