Fix: Unity ScriptableRenderPass Depth Not Bound

A custom URP fog pass samples _CameraDepthTexture. It reads all zeros — URP didn’t produce the depth texture because nothing requested it.

Declare the Input

public class FogPass : ScriptableRenderPass
{
    public FogPass()
    {
        ConfigureInput(ScriptableRenderPassInput.Depth);
    }
}

URP scans all passes’ declared inputs. If any wants Depth, URP runs the depth prepass and binds _CameraDepthTexture.

Combined Inputs

ConfigureInput(ScriptableRenderPassInput.Depth | ScriptableRenderPassInput.Normal | ScriptableRenderPassInput.Color);

Request multiple. URP produces _CameraDepthTexture, _CameraNormalsTexture, _CameraOpaqueTexture as needed.

URP Asset Setting

Also enable Depth Texture in the URP Asset (or per-camera). ConfigureInput is the per-pass request; the asset toggle is the global enable. Both should align.

Render Graph (URP 17+)

With Render Graph, use resourceData.cameraDepthTexture as an explicit input to your pass node. The graph tracks the dependency automatically.

Verifying

Fog pass samples depth correctly — fog density varies with scene depth. Frame Debugger shows the depth prepass running before your pass.

“URP is demand-driven. Declare ConfigureInput(Depth) and the depth texture appears.”

For mobile, the depth prepass has a real cost — only request Depth in passes that genuinely need it, not speculatively.