6
$\begingroup$

I'm working on a sort of idea that you can make an unique 'drawing' by downloading this blendfile, run the animation and get a truely unique drawing. Key of the concept is that designing needs no skill or knowledge.

Problem: I created a 'drawing machine' that emits random particles (size and life) and paints the canvas by using dynamic paint. But everytime I play the animation the exact same drawing comes out.

Of course I could use seed, but it will contradict the concept.

The Drawing Machine and canvas

|improve this question
$\endgroup$
  • $\begingroup$ typically seeds are initialized with a clock based value to garantee a new random set at every runtime. Ex: seed = int( time.time() ). Are you setting any seed at the moment? $\endgroup$ – Bruno Jan 30 '18 at 11:09
  • $\begingroup$ In PC we have "pseudorandom number generator". It's very near to random generator, but it not relay random. In PC very difficult to get "true" random numbers $\endgroup$ – Crantisz Jan 30 '18 at 11:19
7
$\begingroup$

You can use Drivers to get "random" Seed in Particles settings.

As @Crantisz pointed you can just paste #int( 99 * noise.random() ) as a Seed value and Driver will be automatically added.

Long way:

  1. Right click on Seed and Add Driver > Manually Create Later (Single).
  2. Go to Graph Editor and switch to Drivers mode.
  3. In Drivers tab paste this expression: int( 99 * noise.random() )
  4. Update Dependencies.

Now every time you open Blender Seed value will be different.

settings

|improve this answer
$\endgroup$
  • 4
    $\begingroup$ I want to note, that you can do same thing just by entering #int( 99 * noise.random() ) as seed value: i.stack.imgur.com/GOKuX.gif $\endgroup$ – Crantisz Jan 30 '18 at 12:15
  • $\begingroup$ @Crantisz nice one! The result is the same but amount of steps is hugely reduced. Is the # symbol shortcut for adding Driver? I wasn't aware of this method. $\endgroup$ – cgslav Jan 30 '18 at 12:30
  • $\begingroup$ and also, you can edit this driver without Graph Editor $\endgroup$ – Crantisz Jan 30 '18 at 12:50
  • 1
    $\begingroup$ This helps a lot, but is there a way to work around the disabled auto-run? It make it less automatic. $\endgroup$ – jspr Jan 30 '18 at 12:59
  • 1
    $\begingroup$ @ajwood I've found it in the docs: docs.blender.org/manual/en/dev/animation/drivers/… look for "Expression" paragraph. $\endgroup$ – cgslav Jan 30 '18 at 13:13

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.