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AppGameKit Classic Chat / SetSpriteGroup - Box2D Physics [Tier 1]

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Funnell7
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Posted: 21st Sep 2012 18:38 Edited at: 23rd Sep 2012 13:50
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I'm trying to create two sprites with Physics, one static and the other dynamic... I want the dynamic sprite to be able to pass through the static sprite? Is this possible? I have tried SetSpriteGroup, but believe this is only used for collision detection and not actually physics?



EDIT: Added code snippet...
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MarcoBruti
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Posted: 21st Sep 2012 18:45
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Try to set up physics with SetSpritePhysicsOn, setting to Static (code 1), and then setSpritePhysicsSensor. The sensor does not react but it is capable to detect collision, and can be transparently crossed by a physic sprite.
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Funnell7
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Posted: 21st Sep 2012 18:49
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SetSpritePhysicsIsSensor() is the one I'm after!! Thanks MarcoBruti... Onwards and upwards!!
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Matty H
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Posted: 21st Sep 2012 19:54
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I have not tried these yet but you can assign sprites to categories (1-16 I think).

SetSpriteCategoryBits()
SetSpriteCollideBits()

The top probably sets which category the sprite belongs while the second command sets which categories the sprite should collide with.

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Ancient Lady
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Posted: 21st Sep 2012 20:04
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I use the SetSpriteCategoryBits() and SetSpriteCollideBits() fairly effectively.

But having just been introduced to SetSpritePhysicsIsSensor, I can see some great applications for its use.

Cheers,
Ancient Lady
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Cliff Mellangard 3DEGS
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Posted: 22nd Sep 2012 10:26
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Why dont you simply use negative groups?

You can also set -1 to -16 in the groups where all sprites in -1 one will pass thru each other.

Android 2.3 Gingerbread , ZTE Skate , 480x800 , 800 mhz cpu , Samsung Galaxy Y , 240x320 , 832 mhz cpu
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Funnell7
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Posted: 23rd Sep 2012 13:52 Edited at: 23rd Sep 2012 13:56
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Quote: "Why dont you simply use negative groups?"


I don't think that works. I tried all different combinations of both negative and positive groups. I couldn't get any of them to work... Anyhoo, SetSpritePhysicsIsSensor() works perfectly for me. Thank you for all the replies...

EDIT: Actually, just tried it again. You have to use the same group id if you want them to pass through each other... That seems counterintuitive to me, I would have thought you'd need different group id's and only those within the same group collide?
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Cliff Mellangard 3DEGS
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Posted: 23rd Sep 2012 14:31
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Quote: "I don't think that works. I tried all different combinations of both negative and positive groups. I couldn't get any of them to work... Anyhoo, SetSpritePhysicsIsSensor() works perfectly for me. Thank you for all the replies...

EDIT: Actually, just tried it again. You have to use the same group id if you want them to pass through each other... That seems counterintuitive to me, I would have thought you'd need different group id's and only those within the same group collide? "

Its pretty clever if you think of it!

Putt all enemys and pickups in group -1 and they collide with all other groups but not each other.

I used sensor before this and found this to be better.

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