Draw scenenode "Always on top"

[Qps]

Hi all,

i was wondering how i could ensure that a scenenode is drawn in front of everything else. im using directx not opengl.

I tried playing about with:

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m_material.ZBuffer = irr::video::ECFN_ALWAYS;

And:

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m_material.ZWriteEnable = false;

Unfortunately every thing i tried resulted in the node being drawn on the background or the usual 3d effect. But not infront as i would like it to be.

This is what i have in the render function of the node:

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pDriver->setMaterial(m_material);
pDriver->setTransform(irr::video::ETS_WORLD, irr::core::IdentityMatrix);
pDriver->drawIndexedTriangleList(&lineVertices[0], 4, &indices[0], 2);

i could render it in a different draw call on the scene but is that the only way or is there an easier way.

thanks in advance

[hendu]

Besides turning off Z testing and writing, you also need to draw it after everything else.

[Mel]

No, don't turn off Ztesting and writting, or else the node won't draw properly. Instead, draw all the objects of the scene but the one you want on top, then clear the ZBuffer, and after, draw your node manually.

[Qps]

thanks for your reply, Ill try that today.

[Abraxas)]

Is there a bool field to stop a node from automatically rendering?

When making nodes "invisible" you run into problems with anims and children, so instead of that, is there a way to differ rendering to a manual call?

looking for something like node->updatebutdontdraw(true);

[Mel]

call onAnimate(time);

time is the current time; ex. device->getTimer()->getTime();

this updates the animations of the animators and calls all the childs onAnimate();

[hendu]

@Mel

The code quoted has two tris, made from four verts. It's pretty hard to make those overlap to produce Z errors

[Mel]

Well, i solved the general case,Even for 2 overlapping triangles, that would always work