ChromaRadianceOptions - ComfyUI Built-in Node Documentation

The ChromaRadianceOptions node allows you to configure advanced settings for the Chroma Radiance model. It wraps an existing model and applies specific options during the denoising process based on sigma values, enabling fine-tuned control over NeRF tile size and other radiance-related parameters.

Inputs

Parameter	Description	Data Type	Required	Range
`model`	The model to apply Chroma Radiance options to	MODEL	Yes	-
`preserve_wrapper`	When enabled, will delegate to an existing model function wrapper if it exists. Generally should be left enabled. (default: True)	BOOLEAN	No	-
`start_sigma`	First sigma that these options will be in effect. (default: 1.0)	FLOAT	No	0.0 to 1.0
`end_sigma`	Last sigma that these options will be in effect. (default: 0.0)	FLOAT	No	0.0 to 1.0
`nerf_tile_size`	Allows overriding the default NeRF tile size. -1 means use the default (32). 0 means use non-tiling mode (may require a lot of VRAM). (default: -1)	INT	No	-1 and above
`force_sequential_txt_ids`	Force usage of sequential text token IDs instead of zeroes. Should be used for checkpoints from 2026-05-22 to 2026-06-01 that are trained in this way but do not contain the sequential key in the state dict. (default: False)	BOOLEAN	No	-

Note: The Chroma Radiance options only take effect when the current sigma value falls between end_sigma and start_sigma (inclusive). The nerf_tile_size parameter is only applied when set to 0 or higher values. The force_sequential_txt_ids parameter is only applied when set to True. When nerf_tile_size is -1 and force_sequential_txt_ids is False, no options are configured and the model is returned unchanged without any wrapper applied.

Outputs

Output Name	Description	Data Type
`model`	The model with Chroma Radiance options applied, or the unchanged model if no options are active	MODEL

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