4 ms·
If you just see the conclusion I think it's hard to immediately grok how rotation can arise from this. This is a great technique for cheaply doing 3D starfield
by coldcity_again 7mo ago
If you just see the conclusion I think it's hard to immediately grok how rotation can arise from this.
This is a great technique for cheaply doing 3D starfields etc on 8-bit machines.
Look ma, no sine table!
- srean 7mo agoA related interesting fact is that small angular motions compose almost like vectors, order does not matter (i.e. they are commutative). This makes differential kinematics easier to deal with when dealing with polar or cylindrical coordinate systems. Large angular deflections while being linear transforms, do not in general commute. It will spoil the linear relation in your elegant expression, but a slightly better approximation for cos for small θ is 1 - 0.5θ²
- coldcity_again 7mo agoGreat point, thanks.