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The Iris Project•16mo ago

Superkat32

Transparency/Translucent Issue with Mod Rendering

I'm currently developing a Fabric mod which uses FAPI's world rendering to create elytra contrails. I'm struggling with a rendering issue specifically when Iris Shaders is installed(no shaders enabled). I am unsure if my code is at fault.

When there is a semi-transparent block(e.g. water or colored glass) behind my semi-transparent contrails, the block doesn't get fully rendered. I had this issue without Iris installed, but was able to fix it by:

• Changing my WorldRenderEventsWorldRenderEvents call from BEFORE_DEBUG_RENDERBEFORE_DEBUG_RENDER to AFTER_TRANSLUCENTAFTER_TRANSLUCENT or LASTLAST. This fix does not work with Iris installed though.
• Changing the shader program on my contrail render layer from the tripwire program to the translucent program.
• Adding the translucent target to my contrail render layer.

Doing these did not fix the issue with Iris installed, however.

Maybe helpful info:

• This is my contrail renderer class (https://github.com/Superkat32/Jet-Lag/blob/master/src/main/java/net/superkat/jetlag/rendering/ContrailRenderer.java). I'm wondering if the drawing of vertex consumers at line 208 and 215 is causing any issues? Code around line 76 may be helpful to know as well(RenderSystem stuff).
• My WorldRenderEvents event call is in the JetLagClientJetLagClient class at line 62. Using AFTER_TRANSLUCENTAFTER_TRANSLUCENT or LASTLAST fixes the issue without Iris, but with Iris installed not only reintroduces the transparency issue, but also makes the contrails move slightly when the camera is moving. Using BEFORE_DEBUG_RENDERBEFORE_DEBUG_RENDER does not introduce the camera issue with Iris, but still has the transparency issue.
• I have tested with:
  
  • Sodium 0.5.11 + Iris 1.7.3
    
    • Sodium 0.6.0 beta 2 + Iris 1.8.3 beta 4
      and the issue still persists.

I'd like to know if there is anything I can reasonably do, whether it be using a built-in Iris shader program or API I'm unaware of, or changing my rendering code.

Thanks!