CODEWITHSUNDEEP
algorithmopenglmathgraphics3d
yang wang
yang wang

Reputation: 163

How to fast estimate the projected area of cube in perspective view?

I can calculate the accurate area by project those triangles face to the camera. But it is slow. So is there any algorithm to estimate the area in a faster way with a given error bound?

Upvotes: 2

Views: 1139

Answers (1)

Sorin
Sorin

Reputation: 11968

Approximate the cube with a sphere, project the sphere and find out the area (the projections is an ellipse scaled down by a factor of the distance).

It's a bit rough but will work well in many cases.

Upvotes: 3

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