ZBrush Tip: Lock Material and Color with MRGB Fill, Bake Polypaint to UV Texture

Lock both your chosen material and color to a subtool with MRGB Fill, then convert the polypaint to a texture for downstream use. This is a fast, reliable way to preserve lookdev intent through UV-based workflows.

Quick setup:

• Ensure your subtool has UVs if you plan to generate a texture map afterward. If not, unwrap quickly with UV Master.
• At the top shelf, enable MRGB (Material + RGB). Use M to affect only material, RGB to affect only color, and MRGB to affect both.
• Pick your target Material and Color (Color picker).
• Tool > Polypaint: make sure Colorize is ON.
• Color menu > FillObject. Your subtool now carries both its material assignment and vertex color.

Bake to a texture (color only):

• With UVs present, go to Tool > Texture Map > Create > New From Polypaint. This writes your polypaint into a UV texture map.
• Tool > Texture Map > Clone Txtr, then Texture palette > Export to your preferred format (e.g., 16-bit TIFF or PNG).

About materials in textures:

• ZBrush materials are shader-based; they are not directly baked into UV textures.
• To capture the material “look,” render BPR passes (Shaded, AO, Cavity, Shadow, Spec/Reflect) and composite them over your color texture in an external editor. This preserves much of the material’s character in a portable form.
• Alternatively, for quick 2D captures of shaded results, use GrabDoc for reference plates, not for UV textures.

Pro workflow tips:

• Use MRGB for the initial FillObject, then switch to RGB for painting color variations without changing material, or to M when testing different materials without affecting polypaint.
• Store your base fill color in a Layer before detailing; you can dial it down later if the color feels too strong after lighting changes.
• Keep your sculpting neutral by filling with a consistent MatCap (e.g., MatCap Gray), then switch materials late in lookdev for objective surface reads.
• If Colorize seems inactive, verify that the paintbrush icon next to the subtool is enabled and that you’re not masked.
• Before converting polypaint to texture, run UV Master with Protect/Attract seams for cleaner distortion, then test with a quick “New From Polypaint” preview.
• When exporting for engines, pair your baked color map with normal and AO maps from Multi Map Exporter for a faithful in-engine result.

Why this matters:

• MRGB FillObject locks the look per subtool, ensuring changes to the active material or color don’t unexpectedly alter already-approved assets.
• Decoupling “material assignment” from “color paint” gives precise control: iterate materials freely while preserving paint, or vice versa.

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