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RENDER_PASS.md

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Render Pass

A custom 'Dream Textures' render pass is available for Cycles. This allows you to run Dream Textures on the render result each time the scene is rendered. It works with animations as well, and can be used to perform style transfer on each frame of an animation.

The render pass and Cycles will both use significant amounts of VRAM depending on the scene. You can use the CPU to render on Cycles to save resources for Dream Textures.

  1. In the Render Properties panel, switch to the Cycles render engine

In the Output Properties panel, ensure the image size is reasonable for your GPU and Stable Diffusion. 512x512 is a good place to start.

A screenshot of the Render Properties panel with the Cycles render engine selected, and the Dream Textures render pass checked

  1. Enable the Dream Textures render pass, and enter a text prompt. You can also specify which pass inputs to use. Using depth information can help the rendered result match the scene geometry.

When using depth, you must select a depth model, such as stabilityai/stable-diffusion-2-depth. Follow the instructions to download a model.

  1. To use the Dream Textures generated image as the final result, open the Compositor space
  2. Enable Use Nodes
  3. Connect the Dream Textures socket from the Render Layers node to the Image socket of the Composite node

A screenshot of the Compositor space with Use Nodes checked and the Dream Textures socket from the Render Layers node connected to the Image socket of the Composite node

Now whenever you render your scene, it will automatically run through Stable Diffusion and output the result. Here's an example using only the Depth pass as input.

Controlling the Output

Depth

Using a depth model and choosing Pass Inputs such as Depth or Color and Depth can go a long way in making the result closely match the geometry of your scene.

Noise Strength

The noise strength parameter is very important when using this render pass. It is the same as Noise Strength described in Image Generation. If you want your scene composition, colors, etc. to be preserved, use a lower strength value. If you want Stable Diffusion to take more control, use a higher strength value.

This does not apply when using the Depth pass input and no color.

Seed

Enabling Random Seed can give you some cool effects, and allow for more experimentation. However, if you are trying to do simple style transfer on an animation, using a consistent seed can help the animation be more coherent.

Animation

You can animate most of the properties when using the render pass. Simply create keyframes as you typically would in Blender, and the properties will automatically be updated for each frame.