relative to model without calculating scale?

Scripting Issues
1

so wich would be the best method for not taking in account a model scale when doing operations relative to that model?

for instance:

#we have a model scaled *.1

if we do:

model.setPos(model,0,0,1)

the model will be displaced only .1 up, when we want to displace it 1 unit

thanks!
c

2

It is logical that if the model is scaled, its local coordinates are scaled too. More, some models are created with Y-up coordinates, while Panda uses Z-up by default. Moving/rotating other nodes relative to such model becomes real mess.
The far better way is to create another model_parent nodepath and reparent the model to it. Then you can move/rotate this model_parent to place the model accurately. If you need to do anything relative to the model, just do it relative to model_parent instead.

3

yep, that is what i’ve been doing…

just wanted to know if there was a magic method built in panda, cause sometimes you want to work just with numbers, not rotating and moving doomies…

Thanks birukoff

4

The best way is not to scale your model at all. It’s a performance benefit if you don’t. Either scale it right in the modeling program, but you can also call flattenStrong after you loaded and scaled it.

model = loader.loadModel(yadda yadda)
model.setScale(.1)
model.flattenLight()

flattenLight applies the transform to the vertices, so you will afterwards be able to do setPos fine.

5

oohhh i see, i was still wondering what was the flatten thing :slight_smile:

so to “flatten” is to rearrange all vertices of the mesh so then the model size resets to 1?

wich is then the diference between strong and light?

wow thanks to flatten sounds a great solution!

6

flattenStrong does a lot more than flattenLight, it also tries to merge all the nodes into one. If it’s a static model, it sure can be a good idea to call first clearModelNodes and then flattenStrong on the model as performance optimization.

7

i see,
so what about animations, still work after flatten calls?

really this will make my life easier!

8

It works with actors, just there are some nuances. Flattening actors: discourse.panda3d.org/viewtopic.php?t=4678
Also, be careful when you use flattening in real-time. It takes quite some time to call flattenStrong().

9

of course it may take his time, specially on complicated models, but thanks a lot for the info, i’ll play a bit with flatten asap :slight_smile: