Sorting of models

• Models are on separate layers
• Models are placed close to center
• Models are true-to-scale
• Logicaly named
• Scene is ready-to-render

Appending models

• Open your own .blend
• Go to File > Append
• Go into models/groups
• Select model/group you want to append

Materials

• Leather - leather texture scale, leather color variation and amount of bump you control via imputs to group.
• To control color of the leather, you use marked color ramp. Bump is computed just for camera rays. This speeds up render and there is no diference.
• Metal - you control just the color tint.
• Smooth padding - you control color and bump strength just via imput to group. As previously, bump is computed just for camera rays.
• Plastic - you control color, bump strength and the scale of bump via group imputs