How can I use the bpy module in Blender to load a human body mesh from a .obj file and colorize each face of the mesh based on the angle between the face's normal vector and the direction of the sun? Specifically, I want to color each face of the mesh using the following formula: (vn•e + 1) / 2, where vn is the normal vector of the face, e is the direction of the sun, and • represents the dot product between vn and e.
import bpy import random filepath = "body_vertor.obj" # Import the mesh from the .obj file bpy.ops.import_scene.obj(filepath=filepath) #bpy.ops.mesh.primitive_plane_add() body = bpy.context.selected_objects[0] #body = bpy.context.active_object #-**************************** r = random.random() y = random.random() g = random.random() alfa = 1.0 color = (r, g, y, alfa) mat = bpy.data.materials.new("body") mat.diffuse_color = color body.data.materials.append(mat) bpy.ops.paint.vertex_paint_toggle(color)
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