Q
Anonymous asked:
How is LOD calculated in game engines? I guess a simple Vector Distance Calculation would be bad for performance. How do game engines calculate that?
A
You can figure out a vector distance pretty fast if you use the dot product. The dot product of two vectors A and B is the Length(A) x Length(B) x Cos (angle between them). If you dot a vector with itself, then you get Length(A) x Length(A) x Cos(0). Cosine of zero is one, so any vector A dotted with itself is Length(A) squared. If we’re doing a comparison, we can take the distance threshold, square it, and compare it to the dot product of the vector from the camera to the object and itself.
[Join us on Discord] and/or [Support us on Patreon]
Got a burning question you want answered?
- Short questions: Ask a Game Dev on Twitter
- Long questions: Ask a Game Dev on Tumblr
- Frequent Questions: The FAQ
Notes
tw1stedsymph0ny liked this thebeigeoverlord liked this
stealthnachos liked this
deusbot liked this
supercomputer276 reblogged this from askagamedev
depravedhomosexual reblogged this from askagamedev
tundra9 liked this
taupewolfy reblogged this from askagamedev
epicamazinggamerpants liked this
rock-soup reblogged this from askagamedev
auttoton liked this
theothin liked this
askagamedev posted this How is LOD calculated in game engines? I guess a simple Vector Distance Calculation would be bad for performance. How do...