I can simulate 1 IP in ModelSim successfully by following the instruction from sim/mentor/msim_setup.tcl.
But If I want to simulate which include at least 2 IPs in ModelSim, I do not know how to setup the environment?
Easiest way is from your Quartus project, go to Tools>Generate Simulator Setup Script for IP. This will give you an msim_setup.tcl for all the IP in your project.
Hope that helps,