GeoMipTerrain error

[vprograms]

Hello,

I have another problem with GeoMipTerrain and Collision detection.After the game start, collision detection won’t work on my GeoMipTerrain.Here is the error and code parts:

Error:

:grutil(error): GeoMipTerrain: root node unexpectedly mangled 256 vs 257

Code (Code is really similiar: https://discourse.panda3d.org/viewtopic.php?t=4536 , but with a few changes):

Terrain:

        self.terrain = GeoMipTerrain("Otok-1")
        self.terrain.setHeightfield(Filename("data/default.png"))
        self.terrain.getRoot().setSz(400)
        self.terrain.setBlockSize(32)
        self.terrain.setFactor(400)
        self.terrain.setMinLevel(3)
        self.terrain.getRoot().reparentTo(render)
        self.terrain.getRoot().setPos(0, 0, -180)
        self.terrain.generate()
        tex0 = loader.loadTexture("data/default_d.png")
        tex0.setMinfilter(Texture.FTLinearMipmapLinear)
        tex1 = loader.loadTexture("data/grayRock.png")
        tex1.setMinfilter(Texture.FTLinearMipmapLinear)
        tex2 = loader.loadTexture("data/hardDirt.png")
        tex2.setMinfilter(Texture.FTLinearMipmapLinear)
        tex3 = loader.loadTexture("data/bigRockFace.png")
        tex3.setMinfilter(Texture.FTLinearMipmapLinear)
        tex4 = loader.loadTexture("data/shortGrass.png")
        tex4.setMinfilter(Texture.FTLinearMipmapLinear)
        tex5 = loader.loadTexture("data/default_c.png")
        tex5.setMinfilter(Texture.FTLinearMipmapLinear)
        tex6 = loader.loadTexture("data/default_l.png")
        tex6.setMinfilter(Texture.FTLinearMipmapLinear)
        self.terrain.getRoot().setTexture( TextureStage('tex0'),tex0 )
        self.terrain.getRoot().setTexture( TextureStage('tex1'),tex1 )
        self.terrain.getRoot().setTexture( TextureStage('tex2'),tex2 )
        self.terrain.getRoot().setTexture( TextureStage('tex3'),tex3 )
        self.terrain.getRoot().setTexture( TextureStage('tex4'),tex4 )
        self.terrain.getRoot().setTexture( TextureStage('tex5'),tex5 )
        self.terrain.getRoot().setTexture( TextureStage('tex6'),tex6 )
        self.terrain.getRoot().setShader(loader.loadShader('terraintexture.sha'))
        self.islandToRen=self.terrain.getRoot()
        self.islandToRen.reparentTo(render)
        self.islandToRen.setPos(0, 0, -180)

Collision detection:

      	mColl=self.initCollisionSphere(self.islandToRen, False)
	mColl[0].node().setIntoCollideMask( BitMask32.bit( 1 ))
	mColl[0].node().setFromCollideMask( BitMask32.allOff())
	base.cTrav .addCollider(mColl[0], self.collHandEvent)
	self.accept( 'into-' + mColl[1], self.collide)
	self.accept( 'outof-' + mColl[1], self.collide2)

     def initCollisionSphere( self, obj, show=False):
        bounds = obj.getChild(0).getBounds()
	center = bounds.getCenter()
	radius = bounds.getRadius()*0.9
	collSphereStr = 'CollisionHull' +obj.getName()
	cNode=CollisionNode(collSphereStr)
	cNode.addSolid(CollisionSphere(center, radius ) )
	cNodepath=obj.attachNewNode(cNode)
	if show:
            cNodepath.show()
            
	return (cNodepath,collSphereStr )

I’m running this on Windows XP.
sorry for my bad english!
Regards,
Veki

[rdb]

The error means some sub-node of the terrain got removed or added. Are you somewhere changing nodes, flattening stuff or adding things like collision nodes to the terrain?

I don’t know what initCollisionSphere does – if it adds a collision sphere to the island, well, that is totally useless in most cases, imho. The terrain has never a shape that looks like a sphere. Instead, you are better off colliding with geometry. But most of the time, you don’t need to collide with the terrain at all – you can use getElevation instead, in most cases.

[vprograms]

Hello,

Are you somewhere changing nodes, flattening stuff or adding things like collision nodes to the terrain?

I’m not sure, but I think that this parts of code are only place where I’m using it.

I don’t know what initCollisionSphere does – if it adds a collision sphere to the island, well, that is totally useless in most cases, imho. The terrain has never a shape that looks like a sphere. Instead, you are better off colliding with geometry. But most of the time, you don’t need to collide with the terrain at all

Yes, it adds collision sphere to the island.I really don’t know why, but I was try to follow this example: http://panda3d.org/manual/index.php/Bitmask_Example

you can use getElevation instead, in most cases.

While I’m writing this I saw your reply, about that:
https://discourse.panda3d.org/viewtopic.php?p=25578&sid=fb1de45e03f2c6f1492d4b22a3445764

Thanks for help!
Sorry for my bad english!
Regards,
Veki