We explain how to texture Rogue One's sardonic droid using Substance Painter.
11. Keyshot preparation
Export your textures from Painter
The textures are exported from Painter using the KeyShot present configuration for Diffuse, Roughness, Height and Metallic. Before we take everything into KeyShot, subdivide your meshes until the geometry smoothens to your liking, whilst ensuring Smooth UV is not active under the 'Tools > Geometry' menu. Remember, every subtool also needs to have a unique name as duplicates will not export.
12. Material preparation
Take care when preparing your materials
In ZBrush the diffuse textures are applied to the meshes in their texture map slot. This is done so UVs are sent with the model to KeyShot. Be mindful that between sessions, the KeyShot bridge may wipe over the materials you've set up if you change a subtool name, for instance. So, try not to rename subtools and keep everything as consistent as possible to prevent this. As a failsafe, get into the habit of saving your materials in a folder.
13. Material focus
Pay special attention to setting up the head's material properties
The head is isolated, since it has a large variety of forms, which allows me to focus and tweak its material properties. Using a metal shader, the rest of the textures are brought in and assigned one by one. Diffuse goes into Colour, Roughness goes into Roughness, Height goes into Bump. Spend some time adjusting the roughness texture brightness and contrast sliders to fine-tune to the desired look.
14. Perturb the surface
Add a subtle grain to the model with a noise texture
To further enhance that metal feeling, a subtle grain is added to the model by layering in a simple noise texture. Using a Bump Add utility in KeyShot, the Chest height map is assigned along with the supplied Metal_Noise_Bump. Be sure to untick Sync on this texture so you can change the mapping to Box Map. Adjust the Bump Add ratio slider and texture intensities to your liking to balance the damage scrapes with this texture.
15. Advance material tuning
Fine-tune your material then duplicate it
Finally, labels are used and our roughness textures are layered into our material again to provide more control over the grimy appearance. Once you're happy with this material setup, we can then duplicate this shader and roll it out to the other components for consistency and assign their respective textures.
16. Create a sandstorm effect
Build up sand deposits across the model's panel crevices
In Painter add a white fill layer with a mask and a Mask Builder Generator. Add a custom grunge texture such as Dirt 1, reduce the default grunge value to your liking and use the AO slider to build up sand deposits in the panel crevices. Increase the layer's roughness, add some height and apply a Sharpen filter.
17. Keyshot dust label
Add a diffuse material type label to your shader in KeyShot
Back in KeyShot, a 'diffuse material type' is added as a label to my shader with a sand RGB colour value. Within the material graph, I import the new textures and assign the base colour texture as the opacity mask, adding the height map into the bump channel for extra definition. You can develop the look further from here.
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