Feature request > 2D
Pixel Collision with Rotated Sprites
spicypixel:
Seems an obvious one to me but having SPRITE and ANIM COLL that works on the ROTATED sprite would be cool rather than based on the original sprite.
Ian Price:
It was suggested years ago.
There are work arounds, although none as smooth or as elegant as a built in rotation collision commands.
In one game I did (Balloonacy for Wiz, GP2X and pc) I drew my roto'd sprite in real-time onto a virtual sprite and used that for collision checking. Worked really well, even on a GP2X. I wouldn't recommend this for lots of roto-collsions though.
The alternative is to pre-render all rotations (if possible) - either as a spritesheet or at the start of the code.
spicypixel:
Had already thought of pre-rendering as it's a technique I have used before sprite rotation was even quick enough on certain other languages :D However firstly don't like the memory overhead especially for a smooth rotation and secondly it should be in there. A real oversight to have roto commands and no roto related collision. Will have to continue making ball games lol.
Ian Price:
If you don't like pre-rendering then the virtual screen in real-time is the only option right now.
Slydog:
I've been noticing that a lot of commercial games don't use pixel-perfect collision detection.
It would be cool to have a new feature (or create a sprite library) that offers adding (multiple?) colliders to sprites.
The basic circular and rectangular colliders would probably be enough for most games.
For example, a typical car sprite, with a body and two wheels: (total size is 128x64)
--- Code: (glbasic) ---car.AddCollider_Box(0,0, 128,32) // Main body - top half of sprite
car.AddCollider_Circle(32,48, 16) // Left Wheel, radius 16
car.AddCollider_Circle(96,48, 16) // Right Wheel, radius 16
--- End code ---
And then have these colliders scale and rotate with the sprite.
Should be much faster and simpler to implement than pixel perfect sprite scaling and rotations.
Just a 'dream' request of course!
One day I may create my own 2D sprite library, but not any time soon!
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