CG Basics - An Introduction to Computer Graphics for Artists - page 33

Fig. 2.27 Start with a container, unfolded fl a t

Fig. 2.28 A polygon traced to match the shape of the outer boundary of the reference carton

• If you don't have a scanner, measure the box with a ruler and then make a drawing
based on those measurements.
• Import your image into your 3D program.
• Trace the outline of the object to make a large multi-sided polygon (Fig. 2.28 ).
• Draw the fold and cut lines into the object by cutting it into smaller sections. For
extra diffi culty, extrude the box to give it a little extra depth (Fig. 2.29 ).
• Project the UVs on the box using a planar projection tool. In this case, you want
it oriented facing up. Some programs are Z-up, some are Y-up, so be sure to
check which type you are using before projecting.
• Create a material, or shader, by going to your materials editor. Use the scanned
image of your fl at carton for the color channel of the shader.

• Assign your shader to your carton (Fig. 2.30 ).

• Make a duplicate of your carton.

• Fold the duplicate (Fig. 2.31 ).