class TGLSurfacePainter: public TGLPlotPainter

 Constructor.

Coords for point on surface under cursor.

Set mesh, normals.

User clicks right mouse button (in a pad).

User's moving mouse cursor, with middle mouse button pressed (for pad).
Calculate 3d shift related to 2d mouse movement.

Additional options for surfaces.

Remove all profiles/sections.

Initialize some OpenGL state variables.

Initialize some OpenGL state variables.

One normal per vertex;
this normal is average of
neighbouring triangles normals.

Set color for surface.

Draw surf/surf1/surf2/surf4

Find bin ranges for X and Y axes,
axes ranges for X, Y and Z.
Function returns false, if logarithmic scale for
some axis was requested, but we cannot
find correct range.

Find bin ranges for X and Y axes,
axes ranges for X, Y and Z.
Function returns false, if logarithmic scale for
some axis was requested, but we cannot
find correct range.

Find bin ranges for X and Y axes,
axes ranges for X, Y and Z.
Function returns false, if logarithmic scale for
some axis was requested, but we cannot
find correct range.

Find bin ranges for X and Y axes,
axes ranges for X, Y and Z.
Function returns false, if logarithmic scale for
some axis was requested, but we cannot
find correct range.

 Draw projections.

 Draw section X.

 Draw section Y.

 Draw section Z.

Clamp z value.

Find 3d coords using mouse cursor coords.
   if (!MakeGLContextCurrent()) {
      static char err[] = { "Apocalipshit!" };
      return err;
}

Generate palette.

Find texture coordinates.

Draw flat textured surface.

Checks, if surf requires texture.

Any section exists.

Any projection exists.

Draw. Palette.
Originally, fCamera was never null.
It can be a null now because of gl-viewer.

Draw. Palette. Axis.