Stange behaviour of useOrderIndependent Transparency

[Evgeni_Popov]

It’s a bit involved, see:

Order-independent transparency + custom shader + needAlphaBlending = broken shader

It’s a bit complicated because you will have to implement the necessary code in your custom shader to support OIT. You should take example on the standard material and look for the ORDER_INDEPENDENT_TRANSPARENCY define. You will also have to add #include<oitDeclaration> and #include<oitFragment> in your shader. Again, look how it is done in the default material (shaders/default.vertex.fx and shaders/default.fragment.fx).

And a working PG:

Order-independent transparency + custom shader + needAlphaBlending = broken shader

You can reuse the existing OIT shader code by using the same #includes than the ones used in the PBR / standard materials. Also, you have to declare the oitDepthSampler and oitFrontColorSampler samplers when you create your material (line 72). To bind the samplers, simply call scene.depthPeelingRenderer.bind(shaderMaterial.getEffect()) (line 80):