Gemstones

BlenderGemGeneration.txt

# Adding Mesh Function
#################################################
import bpy

def add_mesh(name, verts, faces, edges=None, col_name="Collection"):    
    if edges is None:
        edges = []
    mesh = bpy.data.meshes.new(name)
    obj = bpy.data.objects.new(mesh.name, mesh)
    col = bpy.data.collections.get(col_name)
    col.objects.link(obj)
    bpy.context.view_layer.objects.active = obj
    mesh.from_pydata(verts, edges, faces)

# Gem generation functions
################################

def make_gem(rings, faces, gemName):
	verts = []
	for ring in rings:
		for ringPoint in ring:
			verts.append(ringPoint[0])
	add_mesh(gemName, verts, faces)

def new_ring(numberOfVertices, height, radius=1, rotOffset=0.0):
	global globalIndex
	newRing = []
	for localIndex in range(0, numberOfVertices):
		angleStep = 3.141592653589793 * 2 / numberOfVertices
		rot = localIndex * angleStep + rotOffset * angleStep
		vertex = (sin(rot)*radius,height,cos(rot)*radius)
		newRing.append(( vertex, localIndex, globalIndex))
		globalIndex = globalIndex + 1
	return newRing

def cap_ring(ring):
	global faces
	newFace = []
	for ringPoint in ring:
		newFace.append(ringPoint[2])
	faces.append(newFace)

def connect_rings(ring1, ring2, connectionPattern, count1=1, count2=1):
	global faces
	index1 = 0
	index2 = 0
	while (index1 < len(ring1)):
		newFace = []
		for conIndex in connectionPattern[0]:
			newFace.append(ring1[(index1 + conIndex)%len(ring1)][2])
		for conIndex in connectionPattern[1]:
			newFace.append(ring2[(index2 + conIndex)%len(ring2)][2])
		index1 = index1 + count1
		index2 = index2 + count2
		faces.append(newFace)

# OLD EUROPEAN CUT
###############################
verts = []
faces = []
rings = []
globalIndex = 0

r1 = new_ring(8,0.48,0.3)
r2 = new_ring(8,0.27,0.534,0.5)
r3 = new_ring(16,0,0.75)
r4 = new_ring(8,-0.27,0.6,0.5)
r5 = new_ring(8,-0.95,0.05,0.5)
cap_ring(r1)
connect_rings(r1,r2,[[0,1],[0]])
connect_rings(r1,r2,[[1],[1,0]])
connect_rings(r2,r3,[[0,1],[2]],1,2)
connect_rings(r2,r3,[[1],[4,3,2]],1,2)
connect_rings(r3,r4,[[1,2],[0]],2,1)
connect_rings(r3,r4,[[2,3],[1]],2,1)
connect_rings(r3,r4,[[2],[1,0]],2,1)
connect_rings(r4,r5,[[0,1],[1,0]])
cap_ring(r5)
rings.append(r1)
rings.append(r2)
rings.append(r3)
rings.append(r4)
rings.append(r5)
make_gem(rings,faces, "Old European Cut")