everything transparent that is not overlapping (on screen/2D) with other transparent elements can be grouped.
it can still work otherwise if the elements you group will be placed very close to each other (so f.e. all pegs of a slingshot or under one plastic or similar).
basically what happens (currently, subject to change maybe in VP10.1) is that we need to sort all transparent objects back to front and draw it this way. so if we only have giant elements (e.g. all pegs, all plastics) then the sorting can fail and the result will look wrong.
if elements are not featuring transparency then grouping -everything- that has the same material/image/etc is best, as we then can draw them in one go instead of multiple draws, which can help tremendously. you can take a look at the stats with 'F11'. the lower the number of state changes, the better the performance will be.
and grouping primitives together will reduce this.
(this is basically also what games do, but there an army of artists and sophisticated tools take care of that, so currently in VP you have to do this on your own for best performance)




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