Transparent materials, like glass, water, and air, cause light to slow down, or what we observe is a bending of backgrounds. The density of the material will influence the light to a greater degree, known as the material's Index of Refraction.
TUTORIALS & HOW-TO GUIDES
Light effects are known as Caustics. Letting the white of the paper leak through your marker work can lend itself to this affect.
Leave the area through glass lighter, or less developed than areas we see through air only.
It helps to render the corners a little darker, especially where planes overlap.
Glass is primarily revealed by its edges, so don't be afraid to go deep on the edges; add in darker greys to your base blue or green tint.
* Estimate only. See instructor and calendar for specific due dates. Summer Session schedule is more compressed with one week equal to approximately two and half semester weeks.
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