It is best to do not in max, as you described. It is best to do in the program Marvelous Designer. This is a program for working with tissues. Of course the first two days will be a little lower, but then everything will turn out very easily. The essence is as follows:There is some model on which you need to drop the fabric, I have a sofa. The model must be necessarily high-polygonal with a dense mesh (even if you use a low-poly model in the scene, you have to wind segments, apply a turbo-stub, etc.):Next - export the model in obj format - File - export - export selected - a window will appear where you need to specify the save path and name the file - save - the window will appear, at the bottom you will select Preset - zbrush - export - done.You open Marvelos. There are two windows, in the left there is an aunt, in the right pattern of her clothes. We do not need all this. Delete the aunt:Avatar - clear AvatarRemove the clothes:File - New.Now we need to upload a new avatar - my sofaFile - import - OBJ - select the saved sofa in OBJ. It is important that when exporting from Max the sofa should stand exactly in the center of the axes of coordinates, and its legs should be in zeros, that is, along the Z axis. A window will open where the program will ask how to import, put - as an avatar and mm.In short, I did not get out of the couch, but here's the chair:
Next, create a rectangle in the right window of the desired sizeOn the buttons and have as we want the fabric to fall:
Push the simulation button and the fabric will fall:Next, press the simulation button, and File-export -OBJ, Avatar shape daws to remove.
We attach to the max through import and our fabric beautifully and accurately in the required form lies, has the correct UWV coordinates. Texturim.About the textur in the second part ...😁