Hello,
I’m trying to write a shader based on the unity’s built-in TreeSoftOcclusionLeaves shader.
I have almost gotten it right except for implementing the directional shadows.
My project is specifically restricted to 1 pixel light per scene, with distance shadowmask lightmapping, so the sun is the only realtime non-baked shadow-casting light in the scene.
I flew by this problem a lot trying to implement lighting and shadowing in forward rendering shaders. I cannot seem to find any documentation on it.
I use SHADOW_COORDS macro in v2f struct,
TRANSFER_SHADOW at the end of vertex shader,
and LIGHT_ATTENUATION to get the shadow value in pixel shader.
To clarify the problem, I’ve returned only the calculated LIGHT_ATTENUATION out of the tree canopy shader.
In most cases, it looks fine:
But when I move the camera around (positions and view directions are always the same when this happens):
I have verified via Frame Debugger that shadows are indeed drawn correctly in the shadow buffer, always. But for some reason, LIGHT_ATTENUATION doesn’t return correct values when camera is facing the wrong way.
The entire shader is here:
You can easily try it by creating a material from it and assigning it to standard asset’s Alder tree model’s canopy (leaves part).
- EDIT - You can also download the Unity package from the attachments. It contains a tree prefab with the shader already good to go.
What I’ve tried:
- Disabling instancing
- Changing given UV index to SHADOW_COORD
- Removing all the vertex animation from it
Nothing worked so far.
Any insight to this? I’d much appreciate it!
3485291–277360–tree_shader.unitypackage (1020 KB)
