Currently working on adding a dynamic command arrow that follows the cursor on the display. However, I have encountered an issue where it gets obscured by other elements on the screen. Is there a method to adjust the z-buffer or implement a workaround to always display the arrow on top? I would rather not create a secondary scene overlay like the solution mentioned in this thread: Three.js - Geometry on top of another. Appreciate any insights or suggestions. Thank you.
My approach involves
assigning a render order based on a z-index value or defaulting to 999,
disabling depth testing and writing on the mesh material,
and clearing the depth buffer before rendering the mesh.
Could you elaborate on what the term "command arrow" means? If you're looking to have something track the mouse in a 2D space, one method involves creating a container like this:
<div id="mouseTrack" style="position: absolute; z-index: 999"></div>
Then, you can implement a script to continuously update the position of the div based on the mouse movement:
<script>
<!-- If using a library like jQuery with a mousemove event handler -->
$('body').mousemove({
document.getElementById('mouseTrack').style.left = e.pageX;
document.getElementById('mouseTrack').style.top = e.pageY;
});
</script>
If you have the need for a 3D element to track the mouse, the challenge lies in ensuring the correct relative position. One approach involves creating a THREE.WebGLRenderTarget with its own scene displaying the 3D object against a transparent backdrop, then using it as a texture on a THREE.PlaneGeometry positioned in front of the camera. I would be happy to provide code snippets, but I would require more information about your specific configuration to tailor the solution effectively.
This is currently working well for me
mesh.renderOrder = zindex || 999
mesh.material.depthTest = false
// UPDATE Make sure to include transparent materials if using models with transparency
mesh.material.transparent = true
There's no need to set depthWrite to false. For more information on depthTest and depthWrite, refer to this helpful answer - https://example.com/a/37651610/14208501.
If you're working with a model that has transparent materials, be sure to add 'transparent' to your line, as transparent materials in Three.js have their own sorting and are rendered after non-transparent materials.
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