MiniMax H3: how do you prevent faces from melting in full-body shots?
I’m testing MiniMax H3 locally in ComfyUI. In full-body shots, the initial face looks correct, but it quickly becomes soft, distorted, and unrecognizable when the character starts moving.
I tested:
- I2V and Ref2VA
- 480p and native 1344×768
- Official and Spectrum workflows
- from 12 to 20 steps with a fixed seed
- A separate high-resolution face reference
ref_image_size = max- Static camera and minimal movement
- Short face-priority prompts
The problem remains at native resolution. A paid 2K API test preserved the face correctly, so this appears related to local resolution or precision.
Has anyone achieved a clean, recognizable face in a true full-body shot locally? Which model precision, VAE, sampler, scheduler, or workflow worked for you?
GPU: RTX 4070 Laptop, 8 GB VRAM
Duration: 5 seconds at 24 FPS
Seed: 12370778689767
Sampler: res_multistep
Scheduler: simple
Steps: 12
Resolutions tested:
864×480
1344×768 native
Models:
minimax_h3_fl2va_pruned_int8_convrot.safetensors
minimax_h3_ref2va_pruned_int8_convrot.safetensors
Text encoder:
qwen3vl_32b_minimax_h3_nvfp4_awq.safetensors
Video VAE:
minimax_h3_video_vae_fp16.safetensors