Thanks a lot, scoobyclub! I think my idea of lines needing to be perpendicular does not contradict yours. I should have said the lines needs be perpendicular in 3D space. Or did I miss your point?
Also I agree with you, in the two examples, only the first one looks valid to me. The second one just looks awful. Would this mean there are certain range of angles these two boxes can possibly intersect? Or is there a way to fix the second one?
When an intersection line crosses the edge of a box the intersection line forms an angle less than 90 degrees in 3D space:
yup, you are right!
Some of you may remember James Gurney's breathtaking work in the Dinotopia series. This is easily my favourite book on the topic of colour and light, and comes highly recommended by any artist worth their salt. While it speaks from the perspective of a traditional painter, the information in this book is invaluable for work in any medium.
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