I'm afraid this change is incomplete.

DecalGeometry expects that a normal attribute is always present right now. Hence, the module always generates normals for the resulting decal geometry.

If no normals are available in the base geometry and you want to support this input, you have to make sure:

• Normals are optional in DecalVertex.
• Normals are optional during the clipping process.
• Normals are optional in the final decal geometry.

I'm afraid this change is incomplete.

DecalGeometry expects that a normal attribute is always present right now. Hence, the module always generates normals for the resulting decal geometry.

If no normals are available in the base geometry and you want to support this input, you have to make sure:

• Normals are optional in DecalVertex.
• Normals are optional during the clipping process.
• Normals are optional in the final decal geometry.

should a specific parameter be passed to skip normals ( useNormals: boolean ) or should it be inferred based on the presence of the attribute?

I'm afraid this change is incomplete.

DecalGeometry expects that a normal attribute is always present right now. Hence, the module always generates normals for the resulting decal geometry.

If no normals are available in the base geometry and you want to support this input, you have to make sure:

• Normals are optional in DecalVertex.
• Normals are optional during the clipping process.
• Normals are optional in the final decal geometry.

also wanted to mention that the current change with the simple check fixes the issue and doesn't throw any errors.
tested locally with the normal attribute missing and everything went smoothly.

should a specific parameter be passed to skip normals ( useNormals: boolean ) or should it be inferred based on the presence of the attribute?

The normal generation for decals should be inferred from the base geometry. So no parameter.

also wanted to mention that the current change with the simple check fixes the issue and doesn't throw any errors.
tested locally with the normal attribute missing and everything went smoothly.

The decals still end up with invalid normal data which isn't right.

Closing in favor of #29536.