ZBrush Tip: ZBrush: Diagnose and Eliminate Projection Seams

Seeing faint seams after projecting photos or transferring color? Use this focused workflow to clean them up fast—and keep them from coming back.

Diagnose the seam precisely

• Switch to Flat Color material to evaluate pure color without shading artifacts.
• Tool > UV Map > Morph UV to flatten the mesh and quickly spot misalignment across islands.
• Tool > Polygroups > UV Groups, then enable PolyFrame to visualize UV island borders in 3D.
• Tool > Masking > Mask by Border to isolate UV edges for controlled cleanup work.

Clean up the color where seams are visible

• Turn off Texture Map, turn on Colorize, and paint directly on Polypaint to remove visible texture edges.
• Morph UV and paint while flattened: both sides of the seam are adjacent here, making color matching effortless. Unmorph to return to 3D.
• Use Standard brush with RGB only (Zadd/Zsub off), low RGB Intensity (5–15%), and LazyMouse for smooth, even strokes across the seam.
• Use the Smudge brush at low Intensity to blend transitions; alternate with Soft Paint strokes for controlled gradients.
• Store a Morph Target before projection; after projecting color, lightly use the Morph brush to roll back only the noisy edges.
• For photo-derived fixes, align a clean reference on a duplicate subtool and use the ZProject brush (RGB only) to average color across the edge.
• If projection pulled backfaces, enable Brush > Auto Masking > BackfaceMask while painting to keep color where it belongs.

Rebake textures with proper padding

• Set an adequate UV Map size (4K or 8K) before baking from Polypaint to avoid pixel-thin borders.
• Tool > Texture Map > Create > New From Polypaint to bake color cleanly from vertices to texture space.
• Use ZPlugin > Multi Map Exporter and set Map Border (padding/dilation) to 16–32 pixels to prevent mip/LOD seams in DCCs and game engines.
• For Normal/Displacement maps, enable Smooth UV in their respective palettes to reduce shading discontinuities along UV borders.

Prevent seams on the next projection

• Avoid tiny UV islands and maintain consistent texel density; keep seams in hidden or low-contrast regions.
• Subdivide sufficiently before projection (enough vertex density to hold color without aliasing).
• For Spotlight/photo projection: paint with RGB only, use LazyMouse, and sample frequently with C to match tones before crossing a seam.
• When transferring color between meshes, Project All with RGB only and use stored Morph Targets to non-destructively clean spill.
• After baking, test in your target renderer with trilinear filtering and adequate padding to confirm no visible edges.

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