How to manually retoppo a high poly scan from Polycam to a clean low poly model with Instant Meshes and Blender. *Different technique from my last tutorial
Process:
1 - import Polycam scan into blender
2 - Edit Mode / Mesh / Cleanup / Merge by Distance
3 - Go into shader tab, remove normal map, then replace image texture with albedo
4 - Use Boolean intersect modifier with a cube or simple mesh to cutout desired object(s)
5 - Sculpt and delete unwanted geo (experiment with different selection methods and views)
6 - Once happy with mesh, export obj and bring into Instant Meshes
7 - Retoppo in Instant Meshes and replace obj with quads low poly obj
8 - Play with vertices of low poly version to fit perfectly 1:1 with high poly mesh silhouette. May have to model with the extrude and bridge tools, snap and merge vertices, etc.
9 - Add new material to low poly object (if one doesn't exist already)
10 - In edit mode shift select, double click to get entire line, and mark seams using the edge menu. Watch a UV mapping tutorial for best practices.
11 - Once your UV map is readable in 2D, add a tiling UV texture to the low poly mesh material to check if there's any poorly UV'd surfaces.
12 - Using cycles renderer bake diffuse texture with Select to Active (first shift select the low poly model, then the high poly model), then set Extrusion to 0.001 m and Max Ray Distance to 0.01 m. Note, these values only work for default Polycam scale, if you resized it, you have to tediously experiment with values which takes a looong time to get right.
13 - Wait 5-30 minutes (depends on resolution and complexity) for texture to bake. Save baked texture in texture paint window, or hit Alt S
14 - Use clone stamp tool in texture paint mode to clean up the texture, then save as you go.
15 - You're basically finished. Pat yourself on the back, you've successfully retopologized a photogrammetry scan in Blender!
Links to software mentioned (all free):
Meshroom - alicevision.or...
Blender - www.blender.org/
Instant Meshes - github.com/wja...
Music in Background:
夢のさざなみ Dream ripples
Негізгі бет Polycam retopology in Blender
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