[SOLVED] Model vertex order

[Gleb_Valin]

Hello, I’m loading an obj-model and it looks like vertices are placed in the buffer in different order. How can I get the original order from loaded model?

[pspeed]

@Gleb_Valin

looks like vertices are placed in the buffer in different order

How are you determining this?

[thetoucher]

If you are exporting from blender, at the bottom of the options is :

may be worth a try

[Gleb_Valin]

I just invoke in debugger

mesh.getBuffer(VertexBuffer.Type.Position).getElementComponent(0, 0)
mesh.getBuffer(VertexBuffer.Type.Position).getElementComponent(1, 0)
mesh.getBuffer(VertexBuffer.Type.Position).getElementComponent(2, 0)

and see that the results don’t correspond to obj’s vertices 0, 1, 2, but 1, 0, 3557

[Gleb_Valin]

I don’t export from blender, I generate file in .obj format and I compare vertex order in that file and in the vertex buffer

[pspeed]

At quick glance, it looks like the OBJLoader might be doing some reduction:

jMonkeyEngine/jmonkeyengine/blob/master/jme3-core/src/plugins/java/com/jme3/scene/plugins/OBJLoader.java

It’s possible that all of your original vertexes might not even be there.

It’s very strange to need this information, though. There may be a better way to do what you really want.

[Gleb_Valin]

Well in that case it seems that I have to use custom obj loader and create mesh by myself
Thank you

[pspeed]

@Gleb_Valin

Well in that case it seems that I have to use custom obj loader and create mesh by myself

But why is vertex order important? It seems like there might be better ways to do what you are really trying to do.

Be careful not to be a victim of the “inject things into my stomach” syndrome.

Problem to add texture to a Mesh

@aprouzeau said: Ok I get this now, but how define the index in order to draw a surface passing by all the points defined ? Knowing the fact that I don’t know the coordinates of the points when I write the code. This is starting to feel kind of like a “How do I inject something right into my stomach?” sort of conversation (*). You have already ended up at some strange end place when chances are there were earlier choices to make that would make it a non-issue. Unfortunately, we don’t know wha…

Maybe it really is critical to have a specific vertex order but it comes up so rarely (never?) that it’s worth looking into why it’s important to you and if there is a better way to achieve the final results. Relying on it certainly seems very fragile.

[Gleb_Valin]

Well I perform some basis-specific linear transformations, that’s why order is significant
Now it’s ok, I’ve already used custom loader and manually initialized mesh, everything works now