Own map with "magic marking" over TextureArray

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Addendum:

If I in the shader already retract the position in the 3d space, then the implementation of the nebulization is almost forced:

I just have to calculate the distance to the camera to know the intensity of the cloud. And since I also know “y”, I can represent the cloud as a gradient. Dark and somewhat moddy below, rather light gray above.

The heart of the fog is this snippet of code from the frag-shader:

    #if defined(HAS_FOG) || defined(HAS_MAGICMARKMAP) || defined(HAS_MAGICMARKINDEX1) || defined(HAS_MAGICMARKINDEX2)
        vec4 worldPos = g_WorldMatrix  * vec4(position, 1.0);
        float rP;
        float rR;
        float reduction;
    #endif

(…)


    #ifdef HAS_FOG
        float fog_x=  m_FogCamPos.x  - worldPos.x;
        float fog_z=  m_FogCamPos.z  - worldPos.z;
        float fog_y=  max(0.0,min(1.0, worldPos.y / m_FogTop));
        vec4 fog_color = m_FogStartColorUp*fog_y + m_FogStartColor0*(1.0-fog_y);
        rP = max(0.0, fog_x*fog_x + fog_z*fog_z - m_FogStartDistanceSqr);
        rR = min(1.0, rP / m_FogDistanceSqr); 
        color =fog_color*rR + color*(1.0-rR);
    #endif

The new MaterialParameters are:


        Vector3 FogCamPos           //  x-y-z camera position in 3d space, clear Param == fog is off
        Float FogStartDistanceSqr   //  Start distance ^2
        Color FogStartColor0        //  Start color on y == 0
        Float FogTop                //  y of FogStartColorUp
        Color FogStartColorUp       //  Start color on y == FogTop
        Float FogDistanceSqr        //  distance ^2
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