Open Blender 2.80 (January 21, 2019)
I am work to add materials.
'Materials' rename to 'One' is original already there.
Two new one materials
Three new one materials.
One is fire on the floor.
Two is fire on the 4 Walls (not work) collada.
Three is black on the outside wall and below (not work) of collada.
Export: Collada .dae
.dae you can see only texture fire on the floor. Why not work on walls but disappear itself.