Issue (Brief):
Metallic or shiny MaterialVariants applied to vehicle models result in visible triangulation effects. This occurs on any tileable material but is more obvious on certain finishes. The issue affects multiple vehicles across our game lineup, rather than isolated models.
Issue (Detailed):
When metallic or shiny finishes are applied to vehicle models, a visible triangulation effect appears on the vehicle bodies. This occurs consistently across all models utilizing these MaterialVariants. Our team has attempted multiple solutions including modifying materials, adjusting mesh structure, and reducing shine but these approaches have not resolved the issue. Reducing material roughness to near zero slightly decreases visibility but significantly alters the intended appearance, making this approach impractical.
Currently, the only effective workaround is manually creating UVs for the entire vehicle body. However, as illustrated in the example images below, the root issue seems to relate to how Roblox’s engine applies tileable materials.
During an unrelated meeting, our team discussed this issue with Roblox engineers who suggested submitting a bug report. Their initial assessment indicated this is an engine or Studio issue, rather than something we can/should address internally.
Reproduction Steps
- Open Roblox Studio and create a new baseplate project.
- Insert the vehicle model included in the files within the private note
- Ensure the mesh has auto-generated UVs.
- Create or assign a MaterialVariant with a metallic or shiny appearance (Also in the google drive)
- Apply the MaterialVariant to the vehicle’s body parts.
- Inspect the vehicle from various angles.
Image 1 (Lightshot)
Image 2 (Lightshot)
Image 3 (Lightshot)
Attached in the staff private note is a google drive link containing example materials / example vehicle. Reported on behalf of @Eriiicx
Expected behavior
Expected Outcome:
MaterialVariants should tile smoothly on vehicle bodies without causing visible triangulation.
Actual Outcome:
MaterialVariants applied to vehicle bodies produce noticeable triangulation effects.
A private message is associated with this bug report