[Solved]3Dline are visible only under certain angle

[RVM]

Hello,

I draw a 3D line with this code in a 3D environment with a skybox, some 3D mesh and a FPSCamera :

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VideoDriver->draw3DLine(irr::core::vector3df(0,50,0),irr::core::vector3df(0,-500,0));
 

Before I do :

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irr::video::SMaterial m;
    m.Lighting = false;
    VideoDriver->setMaterial(m);
 

But I see this line under few angle and not all the time...
Any reason ?

Thanks you for enlightening me,
RVM

[hybrid]

You have to set the transformation matrix as well. Please read the API docs again.

[RVM]

I have set the transformation matrix as in the doc :

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VideoDriver->setTransform(irr::video::ETS_WORLD, irr::core::IdentityMatrix);

But don't help.. (http://youtu.be/2D5VSOqHgo0)
I have some orientation error too, the ray start at vector3df(10,10,10) and end at start + vector3df(0,-100,0).

RVM

[smso]

Try either:

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        video::SMaterial lineMaterial;
        lineMaterial.Lighting = false;
        lineMaterial.Thickness = 3.0f;
        lineMaterial.FrontfaceCulling = false;
        lineMaterial.BackfaceCulling = false;
        lineMaterial.MaterialType = video::EMT_SOLID;
        
        driver->setMaterial(lineMaterial);
 

or:

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        camera->setFarValue(40000.0f);
        camera->setNearValue(0.1f);
 

Regards
smso

[hybrid]

Could be that it's just too near to the ground and covered by the terrain due to zbuffer imprecision. near/far value change could already help. Otherwise just disable zbuffer such that the line is not culled. We also support the depth bias in material, but IIRC only starting with Irrlicht 1.8. So might be worth a test, but could take some timeuntil it's available in the stable versions.

[RVM]

Hi,

@smso : I have test with your code but don't resolve this problem.

@hybrid : I have set zbuffer to false, and now, the line go black when I am near.

I have search about my orientation problem and why I have 2 line.
I think it's because I have rotate all world mesh by -90,180,0. And now the Y and Z axis are reversed.
If a take my world bounding box (http://sd-5.archive-host.com/membres/im ... -52-40.png) :
Normally X and Z must be large and Y small but I have for bounding box : Min X: -12.886924, Max X: 13.214664, Min Y: -12.512041, Max Y: 13.214664, Min Z: -0.586996, Max Z: 1.306891
I see also a bug with my bounding box : http://sd-5.archive-host.com/membres/im ... -39-69.png

RVM
PS : I use .X file
PS2 : my main : http://pastebin.com/Tx7ZJEc7 (line 192 for ray) and my word loading code : http://pastebin.com/crNs506m

[hybrid]

Well, you seem to have misunderstood both the API docs and our suggestions. You have to call setMaterial and setTransformation directly before the draw3DLine call. In each render cycle.

[RVM]

Well, you seem to have misunderstood both the API docs and our suggestions. You have to call setMaterial and setTransformation directly before the draw3DLine call. In each render cycle.

Sorry but I didn't know that I must call setMaterial and setTransformation every time before draww3dline in each render cycle...
For me to "set up material before drawing the line", is to set up one time at "setting" of engine (specify one time until the end).

Many thanks, the ray problem is solved ,

RVM