SetCol/DoColl-How to test collisions with different sprites against different colors?

Shatterhand · 10 January 2017, 02:39

in my game I have a sprite I want to test the collision against color 1 of the bitmap, and other one I want to test against color 3 of the bitmap.

so at one point of the main loop I do this:

Code:

SetColl 3,3,1
DoColl
If PColl (0) = -1
   collision code
endif

and another point in the same loop I do

Code:

SetColl 1,3,1
DoColl
If PColl (2) = -1
   collision code
endif

but this does not work.

If I do just one DoColl on the main loop, it works with the first color I set for the collision. If I execute two DoColl on the same loop, nothing works, none of the collisions are tested at all.

Any ideas?

Lonewolf10 · 12 January 2017, 18:51

I'm not a Blitz coder, but are you sure the SetColl values are correct? If they are then are the collision checks executed in the same frame (e.g. between Vbl's)?

I guess that using SetColl (or DoCall) resets all previous collision detections to false, but I don't understand why both collision checks fail.

10 January 2017, 02:39	#1
Shatterhand Warhasneverbeensomuchfun Join Date: Jun 2001 Location: Rio de Janeiro / Brazil Age: 41 Posts: 3,450	SetCol/DoColl-How to test collisions with different sprites against different colors? in my game I have a sprite I want to test the collision against color 1 of the bitmap, and other one I want to test against color 3 of the bitmap. so at one point of the main loop I do this: Code: SetColl 3,3,1 DoColl If PColl (0) = -1 collision code endif and another point in the same loop I do Code: SetColl 1,3,1 DoColl If PColl (2) = -1 collision code endif but this does not work. If I do just one DoColl on the main loop, it works with the first color I set for the collision. If I execute two DoColl on the same loop, nothing works, none of the collisions are tested at all. Any ideas?

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12 January 2017, 18:51	#2
Lonewolf10 AMOS Extensions Developer Join Date: Jun 2007 Location: near Cambridge, UK Age: 44 Posts: 1,924	I'm not a Blitz coder, but are you sure the SetColl values are correct? If they are then are the collision checks executed in the same frame (e.g. between Vbl's)? I guess that using SetColl (or DoCall) resets all previous collision detections to false, but I don't understand why both collision checks fail.

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