Is there any possibility to adding a value beside expression in driven property? Formulas would be only in drivers window or not?
If I need add expression like:
self.location[0]+object.location[1]
< both value dependant
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2 Answers
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A shortcut to entering driver expressions is to start with a # - so entering #frame*0.1 will create a driver expression that sets the value to 1/10th of the current frame. You can then edit drivers using the graph editor in driver mode.
Using the # prefix works for some things that are available globally, like the current frame and some math functions - sin(), log(), noise.random() etc. To get a driver to depend on a transform channel or property, whether it is it's own property or another objects, you create driver variables and use them in your expression.
To see a full list of functions available within drivers, enter bpy.app.driver_namespace.keys() into blenders python console.
You can also define your own functions and add them to the driver namespace as shown here.
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$\begingroup$ Thank you sambler, but this is not what I ask. Problem is that, if I have some expression in property I would like controll the property (animator) even the property is purple (default expresion color) but if i want to set some number it give me only expression as i show in my main question. So I would like to freely controll "expresioned" property without see the expression, only number. $\endgroup$– MRLMar 11, 2018 at 21:40
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1$\begingroup$ @mrl you can't have both, you either use a driver that calculates the value or you manually keyframe the value. Note that you can have a driver read multiple custom properties that you can manually adjust. You can also create your own function which could use a custom property except on frame 125 where it calculates from other sources. You can also enter an expression without the # prefix and it will only be calculated at that time, but you are still limited to what properties you can access. $\endgroup$– samblerMar 12, 2018 at 4:12
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$\begingroup$ Thank you sabler. I asked because with expressions in after Effects it is possible. And I would like round the number I set. In blender I must use other options then. $\endgroup$– MRLMar 12, 2018 at 11:12
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$\begingroup$ @sambler I appreciate your insight, I've used drivers for years and never picked up on this method of input. Awesome nugget. $\endgroup$ Mar 13, 2018 at 9:32
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Yes you can...
You have to have an empty driver 1st... (Via manually create later single)
Then you have to use a slightly different format, but it works...
I have a cube named 'c1' & 'c2':
I added the following line to the "z" location for 'c1' and hit enter.
3.0 + bpy.data.objects['c2'].location[2]
It worked!
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$\begingroup$ The problem with this though, is that it does not update, when you change the z position of
'C2', you have to enter back into the 'z' location property of'C1'and hit enter to force the update. $\endgroup$ Mar 7, 2018 at 19:23 -
$\begingroup$ Thank you, can you please post preent creen of "You have to have an empty driver 1st... (Via manually create later single)" Because I dont understand what you mean. And the value of property will controll some animator, so i would like have only value in Z-location - nothing else. < it must be animable $\endgroup$– MRLMar 7, 2018 at 19:43