You can easily add particles to a scene - but how do you color each particle? In the shader node, you can get each particle instance using the 'object info' - this gives you the position, index and so on - which you can use to calculate the color. A simple example, is to use the 'location' as the base color - so you'll see red, green and blue particles based on their x, y and z world location. For this example though, we'll get the color to match the texture coordinates (put a texture onto a plane and have hte particle cover it and match).
Using a chequered texture pattern as a test - we can show the example working using the simple script.
import bpy
# --- Clear the scene --- bpy.ops.object.select_all(action='SELECT') bpy.ops.object.delete(use_global=False)
# --- Create a plane with checker material for reference --- bpy.ops.mesh.primitive_plane_add(size=10, location=(0, 0, 0)) plane = bpy.context.active_object plane.name = "CheckerPlane"
The above example is a simple test that you can use to check things are working - now we're ready go ramp the idea up a bit more - so we'll load in a texture (a laughing cat)! We'll also modify the particle distribution to be 'unform grid' instead of just a random scattering for the starting location.
We'll also mix in some forces - so they float away ;)
See a quick screenshot of the effect after a few frames - still makeout the cat!
import bpy
# --- Clear the scene ---
# Ensure we're in object mode before modifying objects if bpy.ops.object.mode_set.poll(): bpy.ops.object.mode_set(mode='OBJECT')
# Deselect everything first bpy.ops.object.select_all(action='DESELECT')
# Remove all objects, including hidden and undrawn ones for obj in bpy.data.objects: bpy.data.objects.remove(obj, do_unlink=True)
# --- Create a plane with image texture material --- bpy.ops.mesh.primitive_plane_add(size=10, location=(0, 0, 0)) plane = bpy.context.active_object plane.name = "ImagePlane"
# --- Shader for particle: still using checker (can be swapped if needed) --- mat = bpy.data.materials.new("CheckerParticleMat") mat.use_nodes = True nodes = mat.node_tree.nodes links = mat.node_tree.links
# Clear default nodes for node in nodes: nodes.remove(node)
