with the current 3dgs newton plugin this isn't possible.

newton could easily do that though and with the next plugin version (sorry that it takes so long ) adding static geometry will work like that:

Code:

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ne_treecollisionbeginbuild();
  ne_treecollisionaddmodelgeometry("playground.mdl", nullvector, nullvector, nullvector); // add model as static geometry (position, rotation, scale)
  // other models can be added here
ne_treecollisionendbuild(1, "playground.bin"); // 1 = optimize, "" = filename for storing the optimized geometry for fast reuse with ne_createtreecollisionfromserialization()

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since med can convert wmps and hmps to mdl, every kind of static geometry will have to be added as model. this way it's easy to implement and flexible to use.