Physics and simulation

What you can simulate

• Rigid bodies: falling, collisions, a pyramid of cubes collapsing, dominoes.
• Cloth: a tablecloth on a table, a flag in the wind, a curtain, clothes on a mannequin.
• Soft bodies: jelly, a ball, a pillow.
• Fluids: water poured into a glass, a wave, splashes.
• Smoke and fire: a campfire, smoke from a chimney, an explosion.
• Particles and hair: snow, sparks, grass, fur.
• Force fields: wind, vortex, attraction.
• Dynamic Paint: footprints in snow, wet patches, painting with an object as the brush.
• Simulation in Geometry Nodes: node-based particle and growth systems that evolve frame by frame.

How to ask

• Describe the event and its length: "drop ten cubes onto the table, three seconds".
• Name the properties that matter: "heavy cloth, like velvet", "slow, thick water".
• Ask for a check: "show me screenshots of the start, middle and end".

Examples:

• "Make a tablecloth fall onto a round table."
• "Make the flag wave in a strong wind."
• "Pour water into the glass over two seconds."
• "Add snowfall over the scene."

Baking and rendering

The AI bakes the simulation so it plays back the same way every time and renders without recalculating. Before a background video, ask the AI to bake the simulation to a file cache and show frames from the start, middle and end. Long videos are best rendered in the background: a copy of the scene renders in a separate Blender, your Blender stays responsive, you see the progress and can stop the render — see Rendering.

If a simulation goes wrong, return the scene settings to the checkpoint you need, refine the request and ask the AI to bake again: a checkpoint doesn't roll back the baked file cache. Related: Animation.

Next step: connect ChatGPT, Claude or Codex to Blender.