How to render arrays of objects in a shader?

Unity Engine
1

im trying to render a large amount of meshes using graphics.rendermeshindirect
each mesh has its own objecttoworld matrix and color, i am storing them in compute buffers as the amount can be of any size. i tried following this tutorial and modifying it for arrays, but the result is this..

image
image1098×500 80.2 KB

here is how i am setting the buffers.

image
image551×321 29.7 KB

and ofcourse, the shader code

Shader "MyShader"
{
    Properties{}
    SubShader
    {
        Pass
        {
            Tags
            {
                "RenderType"="Opaque"
                "RenderPipeline" = "UniversalRenderPipeline"
            }

            HLSLPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma multi_compile_instancing

            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"
            StructuredBuffer<float4x4> Objects;
            StructuredBuffer<float4> Colors;
            float4 color_buffer[8];

            struct attributes
            {
                float3 normal : NORMAL;
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
                float4 color : COLOR;
            };

            struct varyings
            {
                float4 vertex : SV_POSITION;
                float4 color : COLOR0;
            };

            varyings vert(attributes v, const uint instance_id : SV_InstanceID)
            {
                const float4 pos = mul(Objects[instance_id], v.vertex);
                varyings o;
                o.vertex = mul(UNITY_MATRIX_VP, pos);
                o.color = Colors[instance_id];
                return o;
            }

            half4 frag(varyings i) : SV_Target
            {
                return i.color;
            }
            ENDHLSL
        }
    }
}
2

whats weird is, if i set every color to white they all appear white, but any other color is black
Update: colors actually do work on the shader side, i just set them wrong
2nd update: i also set the matrixes wrong
the shader works..

3

Can you post the updated code and shader? So we can see how to do it correctly.

4

shader code works, its just that i set the matrixes wrong on my side, you set the matrixes using:
Matrix4x4.TRS(tile.Position, tile.Rotation, tile.Scale) (i set the wrong positions)
and the colors were black because i accidentally set them to black