Hello everyone,
I'm currently setting up our Spine 3.8 workflow in Unity 2019.4.7f1.
We're using:
Universal Render Pipeline 7.3.1 with Unity's 2D Lightning
Linear Color Space
Spine assets with straight alpha and bleed enabled
Spine URP 2D Sprite shader from com.esotericsoftware.spine.urp-shaders-3.8-2019.3
I was following the export and import guidelines as described here: http://esotericsoftware.com/spine-unity
As shown in the screenshot the bleed from the texture is rendered in a light transparency.
When changing the shader to Unity's Sprite-Lit-Default or setting the lightning mode to Unlit in the Spine shader it's rendered correctly.
What am I doing wrong? Is this a bug?
I uploaded a repro project. Just open the example scene in it.
Thanks a lot!
Looks like the alpha blending doesn't happen at all when using straight alpha. (I think) We could fix this by adding the following to Shaders/2D/Include/Spine-Sprite-StandardPass-URP-2D.hlsl after line 106 (APPLY_EMISSION...) :
#if defined(_ALPHABLEND_ON)
pixel.rgb *= texureColor.a;
#endif
