Ogreode static objects

[charlie]

I want to create a static object in my world but it has not the shape of a sphere, box, ... Because until now when I wanted to create a static ogreode object i always used MeshInformer::createStaticBox(..) . Now my Object half rounded, but not a sphere, well hard to descripe. What is the easiest way to get a physical representation of this mesh in the ogreode world?

[monster]

Now my Object half rounded, but not a sphere, well hard to descripe.

A picture's worth a thousand words...

Either approximate your shape with a collection of the supported primitives, offset with Transform geometries (like the helicopter demo) or use a Trimesh.

[charlie]

I tried the createTriangleMesh(..) . This didn't work very well, since the buggy (the mesh should be a jump) got stuck in it. My object should be a simple round jump. (well, I'm new to modelling, too)

I already looked through the helicopter example, but I don't think that method can be applied here.

Here's a picture that shows the problem:

[monster]

Err, OK. The Triangle mesh stuff should work, does it work in the main test demo thing, the one that looks like a little chunk of landscape?

I'm assuming that the white box around your jump is Ogre's bounding box, can you turn on the debugging geometry to see what OgreOde's building for your jump geometry? Just call setShowDebugObjects(true) on your world.

And actually, you could use multiple transformed geometries for your jump, just use a load of long thin boxes, 5 or so judging by your picture, translated and rotated so that the top faces of them coincide with the surfaces on your jump. It'd be a PITA to work out the transformations though!

[charlie]

The Triangle mesh stuff should work, does it work in the main test demo thing, the one that looks like a little chunk of landscape?

yes, works fine

the white box around your jump is Ogre's bounding box

yep

Just call setShowDebugObjects(true) on your world.

Here's the new picture:

you could use multiple transformed geometries for your jump, just use a load of long thin boxes, 5 or so judging by your picture, translated and rotated so that the top faces of them coincide with the surfaces on your jump.

I also had this idea (and that's also what I did) but I thought that there might be a nicer way, since I have this problem not only once...

Although the new picture looks quit good, with the blue triangles. But, the car still get's stuck...

[monster]

A wild stab in the dark, but do you have culling switched off on that ramp mesh? It only seems to be one polygon thick and I can see the "back" of the ramp, even though I'm looking at it's back-face.

If you turn culling on then you might find that the mesh disappears, because you've got the normals pointing the wrong way. This will mess up the tri-collider because it thinks you're driving on the inside of the mesh. So flip your normals in your modeler before you export it.

The triangle mesh collider definitely works, because I'm using it extensively in the new GranTurismOgre demo.

[charlie]

It only seems to be one polygon thick

That's right. I simply took an elipse and used the "extrude" in ac3d

If you turn culling on

Since I now know what culling is (thanks wikipedia )
But the api has so many hits on culling that I'm not sure how to switch it on. Could you give me a hint because this seems to be really helpful for debugging things like this?

Thanks for you help...

But I'm not only new to ogre (and 3d programming) but also to modelling. (but I suppose that got clear because of my questions )

[monster]

In the material it'll say something like "cull_hardware off" and "cull_software off", just delete those lines. Or set the surface to 1 sided in ac3d, then you'll see it looks wrong, so just flip the normals.

[charlie]

Thanks a lot!!

Worked