c_graphene_matrix_unproject_point3d

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
void function(graphene_matrix_t* projection, graphene_matrix_t* modelview, graphene_point3d_t* point, graphene_point3d_t* res) c_graphene_matrix_unproject_point3d;

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