[ADD] - isosirface raytracer now provides zoom info to GBuffer in postprocessing mode.

src/modules/isosurfaceRaytracer/shaders/WMIsosurfaceRaytracer-fragment.glsl

@@ -143,6 +143,10 @@ void main()
     wge_FragColor = vec4( 1.0, 0.0, 0.0, 1.0 );
     gl_FragDepth = 1.0;
 
+#ifdef WGE_POSTPROCESSING_ENABLED
+    wge_FragZoom = 0.1 * v_worldScale;
+#endif
+
     // please do not laugh, it is a very very very simple "isosurface" shader
 
     // First, find the rayEnd point. We need to do it in the fragment shader as the ray end point may be interpolated wrong

src/modules/isosurfaceRaytracer/shaders/WMIsosurfaceRaytracer-varyings.glsl

@@ -39,3 +39,6 @@ varying vec3 v_normal;
 // The isovalue scaled using texture scaling information to [0,1]
 varying float v_isovalue;
 
+// The scaling component of the modelview matrix.
+varying float v_worldScale;
+

src/modules/isosurfaceRaytracer/shaders/WMIsosurfaceRaytracer-vertex.glsl

@@ -81,6 +81,12 @@ void main()
     vec4 camLookAt = vec4( 0.0, 0.0, -1.0, 0.0 );
     v_ray = worldToLocal( camLookAt ).xyz;
 
+#ifdef WGE_POSTPROCESSING_ENABLED
+    // Keep track of scaling information. This is needed by some postprocessors.
+    // TODO(ebaum): I do not yet understand this factor! Fix this.
+    v_worldScale = 0.015 * getModelViewScale();
+#endif
+
     // Simply project the vertex
     gl_Position = ftransform();
     gl_FrontColor = gl_Color;