With the following code
def weight_from_distance( scene ): floor = bpy.data.objects['GridGrass'] cam = bpy.data.objects['Camera'] vert_distances = [ ( cam.location - floor.matrix_world @ v.co ).length for v in floor.data.vertices ] maxDist = max( vert_distances ) minDist = min( vert_distances ) for i, d in enumerate( vert_distances ): # Normalize distance and set as vertex weight floor.data.vertices[i].groups.weight = ( d - minDist ) / ( maxDist - minDist ) #Line 16 pSysName = 'ParticleSystem' vertGroupName = 'GrassGrowth' floor.particle_systems[ pSysName ].vertex_group_density = vertGroupName # Update / Refresh
I get an error
Which seems to be saying that my mesh has no vertices, even though it is a huge terrain mesh with thousands of vertices?
Here's my terrain. It may be worth noting that it's a Grid.