allow stl in heat solver

Author: dbochkov-flexcompute

tests/test_components/test_heat.py

@@ -301,10 +301,9 @@ def test_heat_sim():
     structure = structure.updated_copy(geometry=p, name="polyslab")
     _ = heat_sim.updated_copy(structures=list(heat_sim.structures) + [structure])
 
-    # test unsupported yet geometries
+    # stl support
     structure = structure.updated_copy(geometry=STL_GEO, name="stl")
-    with pytest.raises(pd.ValidationError):
-        _ = heat_sim.updated_copy(structures=list(heat_sim.structures) + [structure])
+    _ = heat_sim.updated_copy(structures=list(heat_sim.structures) + [structure])
 
     # test unsupported yet zero dimension domains
     with pytest.raises(pd.ValidationError):

tidy3d/components/heat/simulation.py

@@ -22,6 +22,7 @@
 from ..geometry.base import Box, GeometryGroup
 from ..geometry.primitives import Sphere, Cylinder
 from ..geometry.polyslab import PolySlab
+from ..geometry.mesh import TriangleMesh
 from ..scene import Scene
 
 from ..bc_placement import StructureBoundary, StructureStructureInterface
@@ -35,7 +36,7 @@
 
 HEAT_BACK_STRUCTURE_STR = "<<<HEAT_BACKGROUND_STRUCTURE>>>"
 
-HeatSingleGeometryType = (Box, Cylinder, Sphere, PolySlab)
+HeatSingleGeometryType = (Box, Cylinder, Sphere, PolySlab, TriangleMesh)
 
 
 class HeatSimulation(AbstractSimulation):