This is indeed likely due to lighting. Try out the LayerLight3D effect which is included in this project. You need to play with the parameters a bit to get something that looks good. See this dev log: https://kindeyegames.itch.io/c3-3dobject-alpha/devlog/324554/light-layer-3d-effe... and this one: https://kindeyegames.itch.io/c3-3dobject-alpha/devlog/330791/add-optional-proced...