Two things
- Is there a way i can only have part of an object visible. Something like attached. This is for a AR Project so i cant just move the object and move it back to the original position like you would when that is off screen.
2
i am trying to do something like this
https://developer.playcanvas.com/en/tutorials/custom-shaders/
but on a 3d model and when the top Diffuse texture channel dissolves a secondary diffuse texture is shown. then a 3rd, 4th … ect
i was thinking you would just need 2 so when 1 dissolves the 2 is shown and texture is replaced on 1 and 2 dissolves to 1 showing a new texture
i was thinking of doing it with an opacity map and changing the alpha test value but that means i would need 2x the geometry
This would need a masking shader, similar to how the UI elements do masking. Not sure if we have something out of the box for this.
Thing 1 - how is the invisible / visible area defined? If it is some kind of box / sphere volume, you could modify shader to discard pixels inside / outside that volume, based on some uniforms you pass in. It it is defined by some other objects rendered, you’d probably need to render them to texture / stencil buffer first and use it as a mask.
Thing 2 - doing multi object solution could work, but might not be very GPU efficient. Custom shader would be a better solution. Something similar to current implementation of detail texture, but with some masking. https://github.com/playcanvas/engine/issues/1962
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In case this is helpful, here is another way to occlude part of an object using invisible occluders.
Requires some custom properties to be set in a material in code (check the included script) and a new Layer.
https://playcanvas.com/project/706714/settings
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@Leonidas Awesome that would work exactly how i want. I will look at the code.
@mvaligursky is the detail map solution you are suggesting implemented into playcanvas yet?
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Yes, the detail map is part of the engine but can only be applied via code at moment. It’s not yet integrated into the Editor
