MiniMax H3 Spatial Guide

Native-size image/video guides and a drag-to-position editor for ComfyUI's native MiniMax H3 model. No additional Python dependencies.

Install

Place this repository in ComfyUI/custom_nodes/ComfyUI-MiniMaxH3-SpatialGuide, restart ComfyUI, and refresh the browser. Requires a ComfyUI version with native MiniMax H3 support. If installing by URL through Manager, use this repository's Git URL.

cd ComfyUI/custom_nodes
git clone https://github.com/meareabc/ComfyUI-MiniMaxH3-SpatialGuide.git

Nodes

Add Spatial Guide for MiniMax H3

• Connect H3 model, positive, video vae, target AV latent, and guide frames image.
• The guide keeps its input dimensions. x and y locate its top-left corner in target pixels: positive x moves right, positive y moves down.
• Connect both output MODEL and positive to the sampler/guider. Connect the target latent directly to the sampler.
• For audio, chain a native Add Guide after this node with only its audio inputs connected.

MiniMax H3 Guide Position

• Set guide_width, guide_height, canvas_width, and canvas_height, or connect their INT inputs.
• Drag the blue guide rectangle; its size stays fixed. Hold Shift to snap movement to 32 pixels. Center and Origin buttons provide quick alignment.
• Connect its x and y outputs to Add Spatial Guide's corresponding inputs. Coordinates save with the workflow and can also be edited numerically.
• Linked Primitive values update the preview immediately. Dimensions computed by other backend nodes synchronize after execution; before the first run the preview uses the saved dimensions. Enter sizes directly for an exact preview before running.

For a 640×480 guide on a 960×480 canvas, x=0,y=0 leaves 320 pixels to the right; x=160,y=0 centers it. For a 480×640 guide on a 480×960 canvas, use x=0,y=160 to center it vertically.

Behavior and validation

Video guides follow native Add Guide's valid lengths: 5, 22, 39… frames; batches below 5 frames use the first image. Nonmultiples of 32 are padded at the right/bottom with replicated edges, without scaling. This is positional conditioning, so generated pixels can change inside the guide region.

CPU tests cover native-size coordinates, mixed guides/audio/references, clone isolation, registration, and a small native H3 forward. Full pretrained outpainting quality has not been validated.

python -m unittest discover -s custom_nodes/ComfyUI-MiniMaxH3-SpatialGuide/tests -v

中文使用说明

重启并刷新后搜索 MiniMax H3 Guide Position，输入参考宽高和目标画布宽高，在预览里拖动蓝框。输出的 x/y 接到 Add Spatial Guide for MiniMax H3；表示参考区域左上角坐标，原点在目标画布左上角。按住 Shift 拖动可按 32 像素对齐，也可点击居中或左上归零。

Spatial Guide 的 MODEL 和 positive 两个输出都要连接到采样器，目标 latent 直接接采样器。音频可用原生 Add Guide 单独添加。