Dyn: Triangle Mesh Set Mass - GameCreators Forum

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DigitalFury

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Joined: 30th Jul 2010

Location: United States

Posted: 6th Jun 2012 09:16

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For some reason the mass is still 0.0. I've played around with the code for an hour and i'm really stuck.

Here is the code I used:

+ Code Snippet

        Object = NextObject()
        Load Object Files(ItemIndex).Path$, Object
           
        Name$ = GetFileName2$(GetFileName$(Files(ItemIndex).Path$)) ` Gets the filename
               		
		TempObject = NextObject() 
        TempMesh = NextObject()       
        Make Mesh From Object TempMesh, Object
		Make Object TempObject, TempMesh, 0
		DeleteMesh(TempMesh)
        
If File Exist(Name$ + ".TMESH") = 0 Then DYN COOK Triangle MESH TempObject, Name$ + ".TMESH"
		DYN LOAD Triangle MESH Name$ + ".TMESH", Object	
		DYN MAKE Triangle MESH Object, Object, Object Size(Object, 1) * 0.1		
		DYN UPDATE MASS FROM SHAPES Object, 1.0, Object Size(Object, 1) * 0.1

To make it easy on myself I set the triangleMeshID to the same thing as the object ID. I got no errors and when I get the mass it is 0.0 for some reason.

I have no idea why I can't make it have mass.

Thanks for your help in advance,

DigitalFury

Get Out Alive (Zombie WIP): My latest zombie game I am working on.

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Matty H

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Posted: 6th Jun 2012 15:24

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I don't think you can give a static actor mass, since it is static and does not move it can be seen to have infinite mass. If you want other things to react differently when colliding with it then it is the materials that need changing.

The command DYN UPDATE MASS FROM SHAPES is used to recalculate the centre of gravity if you manually move or rotate any shapes in an actor.

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DigitalFury

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Posted: 6th Jun 2012 20:41

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@Matty H - How can you make it dynamic then?

DigitalFury

Get Out Alive (Zombie WIP): My latest zombie game I am working on.

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Matty H

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Posted: 7th Jun 2012 12:35

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Triangle meshes can only be static, same with height-fields. I think there was a point once when dynamic triangle meshes were supported but I think they were very slow and unreliable so they have been dropped.

Any complex dynamic object should be made from many simpler shapes(compound actor) or perhaps one 'best fit' convex mesh.

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DigitalFury

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Posted: 7th Jun 2012 20:49 Edited at: 7th Jun 2012 21:01

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@Matty H - Wouldn't that mean that you can use complicated meshes such as a complicated building with stairs and everything?

There may be no way around it. I realize they are slow but I might need that feature for my more complex objects to save me time from manually making physics boxes which could take forever.

DigitalFury

Get Out Alive (Zombie WIP): My latest zombie game I am working on.

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Matty H

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Posted: 7th Jun 2012 22:18

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Triangle meshes are for level geometry like buildings with stairs etc.

What are you trying to create that is complex but needs to be dynamic?

One solution might be to create a convex mesh shape for each limb and then create a compound actor from these shapes, this depends on whether your object has limbs. A method similar to this can be used for characters to get better collision detection from raycasts etc.

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DigitalFury

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Posted: 7th Jun 2012 22:52

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@Matty H - I see your point. Convex meshes might be enough for dynamic objects I just don't know how much detail a convex mesh will cover. Some of my dynamic objects has holes in it that I would like to be shot though using a weapon.

I'll try convex meshes. Hopefully that will be enough.

Thanks for your help,

DigitalFury

Get Out Alive (Zombie WIP): My latest zombie game I am working on.

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