how to add lighting from all direction

[qiminchen]

Hi, thanks for the great work, I'm wondering how to add lights from all directions.

depth_renderer/render_all.py

Lines 236 to 245 in 57af771

	def light_setting_init():
	""" light settings for renderer
	"""
	# Make light just directional, disable shadows.
	world = bpy.data.worlds['World']
	world.use_nodes = True
	# changing these values does affect the render.
	bg = world.node_tree.nodes['Background']
	bg.inputs[1].default_value = 10.0

[qiminchen]

my mesh in meshlab looks like 1st image but I got RGB like 2nd/3rd images (left, right and top are black, apparently affected by the light) after rendering. Are there any ways to solve this? BTW this mesh is from ShapeNetCore.v1