Instanced Drawing

In some cases you might be drawing meshes through one mesh drawing APIs such as Graphics.DrawProcedural or Graphics.RenderMeshIndirect.

Meshes drawn using these techniques can usually be outlined however some things need to be taken into account.

Jump to heading # Layer or RenderingLayerMask

Linework uses the concept of Layer or RenderingLayerMask to control which objects receive outlines. For meshes drawn through code, you will need to set the appropriate layers.

Graphics.DrawProcedural

Takes in a Layer parameter which you can use. Does not support RenderingLayerMask.

Graphics.RenderMeshIndirect

Takes in a RenderParams parameter on which you can set either RenderParams.renderingLayerMask or RenderParams.layer.

See Outline Layers for more information.

Jump to heading # Vertex Animation

You will need to enable the Vertex Animation toggle on your outline for the outlines to show up in the correct position.

To set the outline color, you will need to use the following snippet.

#pragma shader_feature _OUTLINE_COLOR
    
half4 frag() : SV_TARGET{
    #if defined(_OUTLINE_COLOR)
        return half4(1.0, 0.0, 0.0, 1.0);
    #else
        return _Color;
    #endif
}

See Vertex Animation for more information on how to set the color of the outline when using vertex animation.