Groups that contain more than one geode causing issues when exporting to STL format

[awiddess-ccdc]

When there is a group of geodes and you export to STL each geode contains a solid/endsolid When this is processed (using the attached example) you only see a sphere rather than a crystal structure. AABHTZ.zip

Would it be possible to include a boolean to specify whether the geode requires the "solid" to be specified? Or, is there another way of overriding the visitor to allow our own implementation?

[robertosfield]

I'm struggling to figure out what you referring to/have in mind.

Are you talking about needing to extend the STL plugin in some way?

I can't comment on STL plugin specifics without diving into the code - I'm not author of this plugin so am in the same position as yourself w.r.t having to figure out what the codes does, what is appropriate for the file format.

[awiddess-ccdc]

Hi robertosfield, thanks for your comments.

From the specification: `solid

facet normal ni nj nk outer loop vertex v1x v1y v1z vertex v2x v2y v2z vertex v3x v3y v3z endloop endfacet

endsolid `

ReaderWriterSTL.cpp will output the format (above) for each geode within a group. It doesn't necessarily break the specification as the use of "solid" is ambiguous - however, it does beak a couple of 3D printing tools (Microsoft is one).

This is an example (significantly reduced) of what is generated from the ReaderWriterSTL when there is a group of geodes:- solid 0 facet normal 0 -0 0 outer loop vertex -36.7201 7.9413 11.4092 vertex -35.9604 7.9413 11.3428 vertex -36.7201 7.9413 11.4092 endloop endfacet facet normal 0.0172704 0.00304538 0.197401 outer loop vertex -35.9604 7.9413 11.3428 vertex -36.0062 8.20114 11.3428 vertex -36.7201 7.9413 11.4092 endloop endfacet endsolid 0 solid 1 facet normal 0 -0 0 outer loop vertex -61.6544 -38.4334 26.0545 vertex -60.8947 -38.4334 25.988 vertex -61.6544 -38.4334 26.0545 endloop endfacet facet normal 0.0172702 0.00304533 0.197402 outer loop vertex -60.8947 -38.4334 25.988 vertex -60.9406 -38.1736 25.988 vertex -61.6544 -38.4334 26.0545 endloop endfacet facet normal 0 -0 0 outer loop vertex -61.6544 -38.4334 26.0545 vertex -60.9406 -38.1736 25.988 vertex -61.6544 -38.4334 26.0545 endloop endfacet endsolid 1

The boolean, would support wrapping up the output of "solid" and "endsolid" ` if (node.solidRequired) { if (node.getName().empty()) *m_f << "solid " << counter << std::endl; else *m_f << "solid " << node.getName() << std::endl; }

        *m_f << std::fixed << std::setprecision(7);
        for (unsigned int i = 0; i < node.getNumDrawables(); ++i)
        {
            osg::TriangleFunctor<PushPoints> tf;
            tf.m_stream = m_f;
            tf.m_mat = mat;
            tf.m_dontSaveNormals = m_localOptions.dontSaveNormals;
            node.getDrawable(i)->accept(tf);
        }


        if (node.solidRequired)
        {
            if (node.getName().empty())
                *m_f << "endsolid " << counter << std::endl;
            else
                *m_f << "endsolid " << node.getName() << std::endl;
        }

`