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@@ -70,7 +70,7 @@ generate_block(unsigned short mx,
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// Create vertex data and writers
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PT(GeomVertexData) vdata = new GeomVertexData(_root.get_name(),
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GeomVertexFormat::register_format(format), Geom::UH_stream);
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- vdata->set_num_rows((_block_size + 1) * (_block_size + 1));
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+ vdata->unclean_set_num_rows((_block_size + 1) * (_block_size + 1));
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GeomVertexWriter cwriter;
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if (_has_color_map) {
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cwriter=GeomVertexWriter(vdata, "color" );
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rdb