How to draw two intersecting planes. I mean the plane defined by the disintegrating particles
Sorry for the late reply.
Could explain a bit more in which context you would like to use this and what is your goal (e.g. a generic macro to draw interactions or …)?
There are some basic tools (e.g. TPolyLine) to draw geometric figures that could arise from projections, but I am afraid that the projections themselves you have to calculate by yourself.
Also, if you have an example of existing drawing that you would like to do, that may help to find out if it can be done with ROOT and how.