Wobbly Drums

I’m a big fan of the stylized 3D/2D look that has been in vogue recently. I wanted to try my hand at it, so I modelled some 3D drums and applied a rendering pipeline to give them a hand-drawn feel.

The main techniques I employed to achieve this look are

• Outline shader
• Mesh "wobble" shader
• Grain texturing
• Blender grease pencil for the particle effects
• Limited frame rates
• Shape-keys for more organic squash

The outline was the most challenging portion as the typical inverse hull method won't capture internal lines. Often these lines are manually drawn in but I decided to try a different approach:

• Split the mesh into components, each component gets its own outline
• Two render passes for each mesh
• First pass: render the mesh as normal
• Second pass: render the mesh as the solid outline color, expanded by the line thickness in screen space
• Coordinate use of stencil buffer to properly draw outlines