ModelMergeBlocks Node - Quick Reference Guide

🔹 What is the ModelMergeBlocks Node?

The ModelMergeBlocks node in ComfyUI allows you to merge two models (model1 and model2) with fine-grained control over three different structural levels: input, middle, and out. Each slider (ranging from 0.0 to 1.0) adjusts how much of each model influences that specific level of the final merged model.

📊 Merge Settings Breakdown

input   - Base identity: subject matter, style logic, composition
        - 0.0 = 100% model2 base
        - 1.0 = 100% model1 base

middle  - Mid-level structure: anatomy, layout, shape logic
        - 0.0 = 100% model1 mid-layers
        - 1.0 = 100% model2 mid-layers

out     - Surface rendering: textures, finish, lighting
        - 0.0 = 100% model1 output style
        - 1.0 = 100% model2 output style

👀 Which Setting Affects What?

• input:

  • Most influential on subject placement, camera angle, pose.

  • Example: If model1 has better composition, set input: 1.00.

• middle:

  • Controls how forms are built (e.g., limbs, body proportions).

  • If model2 is adding gloves or artifacts, reduce middle to favor model1.

• out:

  • Affects final polish: reflections, color texture, metallic sheen, etc.

  • Can override clean shapes with unwanted visual noise if too high.

🔧 Use Case Example: Avoiding Glove Artifacts

Goal: model1 has clean bare hands, model2 keeps generating gloves.

Recommended Settings:

input: 1.00   # model1 defines subject, camera, core look
middle: 0.25  # structure mostly from model1
out: 0.35     # model1’s rendering style dominates

🔍 Interpretation Tips:

• input is the only one where higher = more model1.

• middle and out are how much you're letting model2 override model1 in those areas.

So:

• input = 1.0 = trust model1’s vision.

• middle = 0.3 = borrow a little structure from model2.

• out = 0.3 = keep model1’s clean visual style.

✨ TL;DR Cheat Sheet

input: model1 vs model2 (base knowledge, composition)
middle: structure blend (form, limbs, layout)
out: polish blend (textures, color, shine)

0.0 = model2 for input, model1 for middle/out
1.0 = model1 for input, model2 for middle/out

PNG with workflow included -