I just discovered:
ClearCollisions clears the list of everything that recently collided, which is the same as doing ResetEntity on all the collided entities. It doesn't clear the list of objects that are checked for collisions. it doesn't do what I want here.
I just ran a speed test, and EntityType model,0 (where 0 is not involved in any collisions) does NOT increase the speed of checking.
In fact it seems that the entity is involved in collision checking because it's the same speed!
In fact, UpdateWorld runs the same whether or not I have ANY Collisions statements. The only thing that speeds it up is HideEntity.
UpdateWorld does more than collision detection, maybe collision detection is actually quite fast, and it's the other things that UpdateWorld does that slow things down?
I don't know - i think I see exponential slowdown the more bullets i have on screen, which would seem to me that there's something going on like bullets x enemies collision checking. just drawing a new bullet should be a linear progression. collision detecting will grow faster.
so, if not collision detection i can't figure out why i'm losing so much speed
here's testing code, kinda interesting.
ClearCollisions clears the list of everything that recently collided, which is the same as doing ResetEntity on all the collided entities. It doesn't clear the list of objects that are checked for collisions. it doesn't do what I want here.
I just ran a speed test, and EntityType model,0 (where 0 is not involved in any collisions) does NOT increase the speed of checking.
In fact it seems that the entity is involved in collision checking because it's the same speed!
In fact, UpdateWorld runs the same whether or not I have ANY Collisions statements. The only thing that speeds it up is HideEntity.
UpdateWorld does more than collision detection, maybe collision detection is actually quite fast, and it's the other things that UpdateWorld does that slow things down?
I don't know - i think I see exponential slowdown the more bullets i have on screen, which would seem to me that there's something going on like bullets x enemies collision checking. just drawing a new bullet should be a linear progression. collision detecting will grow faster.
so, if not collision detection i can't figure out why i'm losing so much speed
here's testing code, kinda interesting.
Open in online IDE; speed test comparing setting EntityType ent,0 to remove from collisions ; vs HideEntity. HideEntity of course removes the entity from sight so ; it doesn't do the same thing. ; verdict - EntityType ent,0 doesn't do anything! ; UpdateWorld still takes the same amount of time. ; Hell it takes the same amount of time if you don't have any Collisions statement. Graphics3D 640,400,0,0 toSphere=1:toPoly=2:toBox=3 makeStop=1:fullSlide=2:preventDownSlide=3 Global T_BULLET=1, T_ENEMY=2 Type bullet Field model End Type Global howmany=200 For t = 1 To howmany b.bullet=New bullet b\model=CreateSphere(8) EntityType b\model,T_BULLET ;HideEntity b\model ScaleEntity b\model,1,1,1 PositionEntity b\model,Rnd(100),Rnd(100),Rnd(100) EntityRadius b\model,1 e=CreateCube() EntityType e,T_ENEMY ScaleEntity e,1,1,1 PositionEntity e,Rnd(100),Rnd(100),Rnd(100) EntityBox e,1,1,1,1,1,1 Next Collisions T_BULLET,T_ENEMY,toPoly,fullSlide runtest("toPoly, fullslide") Collisions T_BULLET,T_ENEMY,toBox,fullSlide runtest("toBox, fullslide") Collisions T_BULLET,T_ENEMY,toBox,makeStop runtest("toBox, makeStop") Collisions T_BULLET,T_ENEMY,toSphere,fullSlide runtest("toSphere, fullslide") Function runtest(description$) For b.bullet = Each bullet ; eventually we either change the entitytype of each entity or we hide them all. ; the speed increase comes from hiding them. ; no speed increase by changing the entitytype. EntityType b\model,0 ; -> no speed increase ;HideEntity b\model ; -> speed increase (uncomment this, and comment the line above to compare) did=did+1 s=MilliSecs() For x = 1 To 300 UpdateWorld ; docs claim this is where collision detection happens. Next e=MilliSecs()-s remain=howmany-did DebugLog remain+" "+description$+": "+e Next End Function WaitKey