__init__.py 文件源码

def createLeaves(tree, probability=0.5, size=0.5, randomsize=0.1, randomrot=0.1, maxconnections=2, bunchiness=1.0, connectoffset=-0.1):
    p = bpy.context.scene.cursor_location

    verts = []
    faces = []
    c1 = Vector((connectoffset, -size / 2, 0))
    c2 = Vector((size+connectoffset, -size / 2, 0))
    c3 = Vector((size+connectoffset, size / 2, 0))
    c4 = Vector((connectoffset, size / 2, 0))
    t = gauss(1.0 / probability, 0.1)
    bpswithleaves = 0
    for bp in tree.branchpoints:
        if bp.connections < maxconnections:

            dv = tree.branchpoints[bp.parent].v - bp.v if bp.parent else Vector((0, 0, 0))
            dvp = Vector((0, 0, 0))

            bpswithleaves += 1
            nleavesonbp = 0
            while t < bpswithleaves:
                nleavesonbp += 1
                rx = (random() - 0.5) * randomrot * 6.283  # TODO vertical tilt in direction of tropism
                ry = (random() - 0.5) * randomrot * 6.283
                rot = Euler((rx, ry, random() * 6.283), 'ZXY')
                scale = 1 + (random() - 0.5) * randomsize
                v = c1.copy()
                v.rotate(rot)
                verts.append(v * scale + bp.v + dvp)
                v = c2.copy()
                v.rotate(rot)
                verts.append(v * scale + bp.v + dvp)
                v = c3.copy()
                v.rotate(rot)
                verts.append(v * scale + bp.v + dvp)
                v = c4.copy()
                v.rotate(rot)
                verts.append(v * scale + bp.v + dvp)
                n = len(verts)
                faces.append((n - 1, n - 4, n - 3, n - 2))
                t += gauss(1.0 / probability, 0.1)                      # this is not the best choice of distribution because we might get negative values especially if sigma is large
                dvp = nleavesonbp * (dv / (probability ** bunchiness))  # TODO add some randomness to the offset

    mesh = bpy.data.meshes.new('Leaves')
    mesh.from_pydata(verts, [], faces)
    mesh.update(calc_edges=True)
    mesh.uv_textures.new()
    return mesh