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// Depth shader
#VS
void main() {
        vec4 pos = u_projViewTrans * (u_worldTrans * a_position);

        v_depth = pos.z;
        gl_Position = pos;
}
#FS
void main() {
        float linearDepth = v_depth * (1.0 / (nearfar.y - nearfar.x));
        gl_FragColor = vec4(linearDepth, 0, 0, 0);
}

// Shader.java
setUniformMatrix("u_invProjView", cam.combined.cpy().inv());

// Shader.frag
### Reconstruction from depth
vec3 getPosition(in vec2 uv) {

        depthv = texture2D(texture0, uv).x;
        //float depth = (2.0 * nearfar.x) / (nearfar.y + nearfar.x - depthv* (nearfar.y - u_frustumNearFar.x));

        // #### IS this right? ####
         vec4 pos = vec4(uv, depthv, 1.0)*2.0-1.0;
         pos = u_invProjView * pos;
         pos = pos/pos.w;
         return pos.xyz;
}