How can I create a mask effect on my scene? I came across this awesome jsfiddle: https://jsfiddle.net/f2Lommf5/4703/
I am interested in making the white part of that texture transparent so that I can crop my background object based on the plane texture above.
I attempted to adjust the alphaTest value but was unsuccessful.
If anyone has any ideas on how to achieve this outcome, I would greatly appreciate it. Thank you!
While I may not have complete clarity on your exact desired outcome, it appears feasible to achieve the effect through post-processing techniques. In this interactive demonstration, a MaskPass is utilized to generate a mask preventing the rendering of certain pixels in the beauty pass. The crucial code snippet is presented below:
var cleanUpPass = new ClearPass();
var maskingPass = new MaskPass( maskScene, camera );
maskingPass.inverse = true;
var mainRenderPass = new RenderPass( scene, camera );
mainRenderPass.clear = false;
var clearingMaskPass = new ClearMaskPass();
var finalOutputPass = new ShaderPass( CopyShader );
// Additional parameters for render target
var settings = {
minFilter: THREE.LinearFilter,
magFilter: THREE.LinearFilter,
format: THREE.RGBFormat,
stencilBuffer: true
};
var customRenderTarget = new THREE.WebGLRenderTarget( window.innerWidth, window.innerHeight, settings );
effectComposer = new EffectComposer( renderer, customRenderTarget );
effectComposer.addPass( cleanUpPass );
effectComposer.addPass( maskingPass );
effectComposer.addPass( mainRenderPass );
effectComposer.addPass( clearingMaskPass );
effectComposer.addPass( finalOutputPass );
It's important to note that the mask object (represented by the plane) exists within a separate scene for effective management.
To view this technique in action, check out the live demo: https://jsfiddle.net/e6p0axb1/5/
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