Sigton wrote:

Please don't necropost guys

Sigton

if touching [sprite v]

if touching <>

point in direction (((-1) * (direction)) v)

< yolo?>

The Stickies wrote:

TheMonsterOfTheDeep wrote:

Because they seem to be cropping up, let me make an offtopic post to clear up some misconceptions about the bounce block…

It's very difficult to make a general “bounce” block, because what it does is reflect the sprite by mirroring its velocity across the line normal to the surface it hits. (Sorry, it's kind of hard to be exactly clear about what it does, so I'm trying to be specific).

However, it's very likely that this block would work imperfectly, at least for bitmap sprites, because the normal line calculated would be more of an “average” normal line than the actual line.

That's not the only problem, of course - the other problem is the question of what to do when the sprite is intersecting (not merely touching the edge of) the other sprite, and what to do when it's touching or intersecting multiple sprites.

The ‘if on edge, bounce’ block is comparatively simple - it merely means that if the sprite is touching or intersecting an edge, reflect across the line perpendicular to that edge in the middle of the sprite, which is really easy to do.

(The reason intersection works for the edge and not for sprites is because the edge is a single line - it's easy to define where the reflection line is, which is straight in the middle of the sprite. However, if it is intersecting a generally shaped object, you also have to calculate the normal line - and where to calculate that is based on where it is touching, which is ambiguous.)

P.S. If you would like to discuss the bounce block more, please make a new topic or find an old one (I'm pretty sure there is at least one old one you can use).

DaEpikDude wrote:

bloop

The Stickies wrote:

TheMonsterOfTheDeep wrote:

Because they seem to be cropping up, let me make an offtopic post to clear up some misconceptions about the bounce block…

It's very difficult to make a general “bounce” block -snip-