[Gmsh] Merge of a surface overwrites an existing Surface( 1 )?

[Rich Bayless]

Hi Mike,

Try this:

//start
//bring in the stl file
Merge "sph.stl";
// define the surface of the stl
Surface Loop(1) = {1};
// define the volume of the stl
Volume(1) = {1};
// then your geometry
Point( 1 ) = { -5    , -5    , -1 };
Point( 2 ) = { -5    , 5  , -1 };
Point( 3 ) = { 5    , 5  , -1 };
Point( 4 ) = { 5    , -5    , -1  };
Line( 1 ) = { 1, 2 };
Line( 2 ) = { 2, 3 };
Line( 3 ) = { 3, 4 };
Line( 4 ) = { 4, 1 };
Line Loop( 1 ) = {1, 2, 3, 4};
// define the rectangle, but as surface 2
Plane Surface( 2 ) = { 1 };
//end

Cheers, Rich
-------------- Original message from "Mike B." <mb78aa at yahoo.com>: -------------- 

Hi All,

It seems that `Merge' of a surface (STL file in my case) overwrites Surface( 1 ).

For example, this file defines a plane surface (rectangle) and imports a sphere saved in an STL file:

Point( 1 ) = { -5    , -5    , -1 };
Point( 2 ) = { -5    , 5  , -1 };
Point( 3 ) = { 5    , 5  , -1 };
Point( 4 ) = { 5    , -5    , -1  };

Line( 1 ) = { 1, 2 };
Line( 2 ) = { 2, 3 };
Line( 3 ) = { 3, 4 };
Line( 4 ) = { 4, 1 };

Line Loop( 1 ) = {1, 2, 3, 4};

// define the rectangle
Plane Surface( 1 ) = { 1 };

Merge "sph.stl";

After running Gmsh shows only there is only surface( 1 ) which is the sphere and not the rectangle. Is this how it's supposed to work?.

Cheers,
Mike.
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