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AppGameKit Classic Chat / SetSpriteShape not forming full shape

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samqweqwe
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Posted: 20th Aug 2013 00:52 Edited at: 20th Aug 2013 00:56
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hello
i have an physics sprite in this shape:



but the shape collision comes out lke this



i have noticed that once the collision box has gone out it does not go back in

i have set SetPhysicsMaxPolygonPoints to 12 ( the max ) but it did not change anything

are there any solutions to this problem?
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Ancient Lady
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Posted: 20th Aug 2013 05:01
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A physics sprite cannot have a concave surface. That is why the collision box is showing what it does.

Cheers,
Ancient Lady
AGK Community Tester and AppGameKit Master
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Markus
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Posted: 20th Aug 2013 09:36
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maybe with AddSpriteShape...
SetPhysicsDebugOn should show the shape at runtume.
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Grook
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Posted: 20th Aug 2013 11:58
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As AL says you can't have a single shape which is concave. You will need to create multiple shapes to get around this as Markus says. Do a search on here for the shape up(?) app written by baxslash, that'll solve your problem.

"Happiness is contrary to the human condition" --White (to Black)
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JimHawkins
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Posted: 20th Aug 2013 14:20
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It's one of the (many) stupid limitations of OpenGL. It's not TGC's fault.

-- Jim DO IT FASTER, EASIER AND BETTER WITH AppGameKit FOR PASCAL
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samqweqwe
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Posted: 20th Aug 2013 15:26
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i dont think shape up will help as it cannot do concave shaped
i tried using AddSpriteShapePolygon but as soon as i got to the concave part the shaped vanished

it there a way to maked an object part not able to have a collision. eg making a circle infront of the rectangle to make a concave shape.
ive included an image of what i mean to download/view
would that work and can it be done

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Ancient Lady
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Posted: 20th Aug 2013 16:42
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Quote: "it there a way to maked an object part not able to have a collision."

No. Collision is checked on each sprite (with physics enabled).

ShapeUp is can be used to create two sprites for your original posted 'image', which has only straight lines. But if you want a true curve, than it might not work.

Cheers,
Ancient Lady
AGK Community Tester and AppGameKit Master
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samqweqwe
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Posted: 20th Aug 2013 17:47
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i have finaly got shape up to work! before when i edited the shape the secondary shape moved aswel

thanks everyone
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Markus
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Posted: 20th Aug 2013 18:23
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what i mean with addshape was try to split the one shape you showed above
in two "triangle" shapes that looks the same you need.
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samqweqwe
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Posted: 31st Aug 2013 20:23 Edited at: 31st Aug 2013 20:30
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is it possible to make collision shapes made with addSpriteShapePolygon to scale with the object?
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baxslash
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Posted: 2nd Sep 2013 14:24
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Quote: "i dont think shape up will help as it cannot do concave shaped"

Not quite true. You can add multiple convex shapes to one sprite using ShapeUp. It's the only way to get a concave shape using Box2D.

You may need to use a number of shapes added to the one sprite to get the shape depending on how big the concave part/s are.

"Here I am trying to do some good for the world..." - Fluffy Rabbit
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MarcoBruti
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Posted: 2nd Sep 2013 17:13
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or you can simply overlap 2 or more convex sprites in order to make a concave sprite. That is what I did with my app App-In-Ball in order to simulate curved elements. Then you can scale as you like the resultant sprite.
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baxslash
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Posted: 2nd Sep 2013 17:28
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That is another way I hadn't thought of that would make it easier for games that have to fit the aspect ratio of the screen, nice thinking! Just don't add overlapping shapes to a single sprite as this causes problems.

"Here I am trying to do some good for the world..." - Fluffy Rabbit
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