February 2019
Intermediate to advanced
292 pages
6h 55m
English
Content preview from The Ray Tracer Challenge
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Finding the Normal on a Cylinder
Once you know the points of intersection, the normal vector is used to help shade the surface appropriately. You’ll only need one scenario to cover this bit.
Test #3: Normal Vector on a Cylinder
Show that the normal vector on the surface of a cylinder is computed correctly.
This scenario chooses four points on the surface of the cylinder, one each at +x, -x, +z and -z, and shows that the normal is the expected value at each point.
| | Scenario Outline: Normal vector on a cylinder |
| | Given cyl ← cylinder() |
| | When n ← local_normal_at(cyl, <point>) |
| | Then n = <normal> |
| | |
| | Examples: |
| | | point | normal | |
| | | point(1, 0, 0) | vector(1, 0, 0) | |
| | | point(0, 5, -1) | vector(0, 0, -1) | ... |
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