ShaderGraph Instancing

[SuperFranTV]

Hello guys,

i’am asking for help, because i don’t know why it’s not working?

My ShaderGraph Setup:
boolean keyword (PROCEDURAL_INSTANCING_ON) multiCompile, global

One CustomFunction as string

#pragma instancing_options procedural:ConfigureProcedural
Out = In;

a hlsl Script for the ShaderGraph to get the StructuredBuffer Data

#if defined(UNITY_ANY_INSTANCING_ENABLED)
StructuredBuffer<float3> _Positions;
#endif

float3 position;

#if UNITY_ANY_INSTANCING_ENABLED
void ConfigureProcedural() {
    position = _Positions[unity_InstanceID];
}
#endif

void ShaderGraphFunction_float(out float3 Out) {
    Out = position;
}

void ShaderGraphFunction_half(out half3 Out) {
    Out = position;
}

And here a picture of the shadergraph node setup:

I tested it with a SurfaceShader, it works fine, but the ShaderGraph renders/shows no objects.

Is there a mistake at some point?

Hope someone see it with differend eyes.

Thank you all

[echu33]

position = _Positions[unity_InstanceID];
You should not just store a uniform variable’s value back from the structure buffer…

Try this approach instead :

#ifndef PROCEDURL_INSTANCE_INCLUDED
#define PROCEDURL_INSTANCE_INCLUDED

struct positionBuffer {
    float4 Position;
};

StructuredBuffer<positionBuffer> _PerInstanceData;

// use #pragma instancing_options procedural:vertInstancingSetup to setup unity_InstanceID & related macro, what vertInstancingSetup do are actually not important 
#if UNITY_ANY_INSTANCING_ENABLED
    void vertInstancingSetup() {
    }
#endif

// Shader Graph Functions
void GetInstancingPos_float(in float3 PositionWS, out float3 Out)
{
    Out = 0;
    #if UNITY_ANY_INSTANCING_ENABLED
    Out = PositionWS + _PerInstanceData[unity_InstanceID].Position.xyz;
    #endif
}

#endif

Instead of store back the strcuture buffer’s value you can just add the value and output the result using OUT keyword.

Also the global keyword

I’m able to use DrawMeshInstancedIndirect api via this approach