Texture Atlas Shader

Unity Engine
1

Hello, it’s me again…

i thought that today i can solve my uv atlas problem, but it seems that im not the best coder in the GLSL/HLSL languages… so my question… can somebody help/show me or give me an example for texture altases.

A full shader example would be nice… as i said im not the best shader coder…

Here are my greedy voxel chunks:

2611362--183090--greedy_nrm.PNG
2611362--183090--greedy_nrm.PNG547×524 95.1 KB
2611362--183091--greedy_wire.PNG
2611362--183091--greedy_wire.PNG541×515 127 KB
2611362--183092--uvs.PNG
2611362--183092--uvs.PNG644×562 303 KB

As u can see the uvs r correct… but i can only display one texture and i don’t want to use submeshes because of performance issues…

I’ve found a solution for texture atlases with greedy meshing:

Thanks to everyone who can help me solving this problem :slight_smile:

MR Michael

2

ok i found a solution… but i works not perfectly…

here is the uv error:

2612892--183246--greedy0.PNG
2612892--183246--greedy0.PNG909×891 281 KB
2612892--183247--greedy_texture.PNG
2612892--183247--greedy_texture.PNG1048×800 184 KB

can somebody explain why the textures r stretched?

this is my shader:

Shader "BioGen/Block" {
    Properties{
        _MainTex("Atlas", 2D) = "gray" {}
    }
        SubShader{
        Tags{ "RenderType" = "Opaque" }
        LOD 200

        CGPROGRAM
#pragma surface surf Standard fullforwardshadows
#pragma target 3.0

        sampler2D _MainTex;

    struct Input {
        float4 color : COLOR;
        float3 worldNormal;
        float3 worldPos;
    };

    void surf(Input i, inout SurfaceOutputStandard o)
    {
        const float gridSize = 8;
        const float margin = (1 / gridSize) / 4; //For 16x16 textures, margin of 1px, 32x32 => 2px etc.
        const float cellSize = (1 / gridSize) - (margin * 2);
        float blockId = int(i.color.a * gridSize * gridSize) / gridSize;

        float2 uv = float2(
            i.worldPos.x * (1 - i.worldNormal.x) + i.worldPos.z * i.worldNormal.x,
            i.worldPos.y * (1 - i.worldNormal.y) + i.worldPos.z * i.worldNormal.y);

        fixed4 c = tex2Dgrad(_MainTex, frac(uv) * cellSize + float2(blockId + margin, floor(blockId) / gridSize + margin), ddx(uv * cellSize), ddy(uv * cellSize));
        o.Albedo = c.rgb;
    }
    ENDCG
    }
        FallBack "Diffuse"
}

and here is my texture atlas, it is 32x32px and i supports 8 textures for now…
2612892--183245--Atlas.png