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DarkBASIC Professional Discussion / Polygon to Polygon collision

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Rob K
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Posted: 21st Feb 2003 00:12
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Here is the situation: I have a tunnel shape (ie semi-cylinder) through which an object needs to travel.

Obviously box collision doesn't work because a collision is registered even if the object is going straight through the center of the tunnel and no collision is actually occuring (the object is much smaller than the tunnel is wide or tall). I have tried both intersect object and SET OBJECT COLLISION TO POLYGONS. I need to find a way that collision is registered if the ball hits the sides or top of the tunnel but not if it is just going through the middle of it.

Does anyone have any ideas on how I could do this?

(Help will be greatly appreciated )
NOBODY has a forum name as stupid as Darth Shader. I do.
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UberTuba
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Posted: 21st Feb 2003 01:06
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why doesn't SET OBJECT COLLISION TO POLYGONS work?

Life is a terminal disease.
You never survive it.
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BackBONE
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Posted: 21st Feb 2003 01:56
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hey darkfluff

if you had read what darth wrote
you wouldnt post like this :-(

Ok.

One way is to set object collision off for the tunnel
so its just for the optix.
Then create boxes and place them on the sides and the top of the tunnel.
Hide those boxes and check the collisions with it.
Its a little more work but thats the way life goes...

see ya
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Benjamin
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Posted: 21st Feb 2003 01:58
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its a good idea if your tunnel happens to have some flat-ish sie

xxxpetratxxx
B. R. W
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Benjamin
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Posted: 21st Feb 2003 01:58
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*its a good idea if your tunnel happens to have some flat-ish sides

xxxpetratxxx
B. R. W
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TheCyborg
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Posted: 21st Feb 2003 02:17
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You cold also make the tunnel an object (.X or something).
I think that will work.

TheCyborg Development.
http://TheCyborg.Amok.dk
The Ultimate Source To DarkBASIC Programming.
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gamefreaks
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Posted: 21st Feb 2003 02:39
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Yeah, If you are using polygon detection on .x objects, then I wont report a collision if you are not actually touching a polygon even on the inside.

Just for the road, I was using a boolean operation in Studio Max, to create the tunnel.

I feel sorry for people who don't drink. When they wake up in the morning, that's as good as they're going to feel all day.
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randi
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Posted: 21st Feb 2003 04:50
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If it's a straight tube it shouldn't be too hard to figure it all out with math, and not use any DB collision.

Randi
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rapscaLLion
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Posted: 21st Feb 2003 05:27
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Ya, figure out were the center of the cylinder is, then you use a simple distance calculation to find the distance between your object and the outer edge. If your distance is greater than the circle's diameter, it's obviously outside

Alex Wanuch
aka rapscaLLion
Kousen Dev Progress >> Currently Working On Editors
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Rob K
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Posted: 21st Feb 2003 23:38
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Thanks, I was just wondering if there was any way of doing it using DBPs collision commands that I had overlooked, seems not so I will use maths instead

NOBODY has a forum name as stupid as Darth Shader. I do.
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