Position in Render does not match viewport. (Driver properties) #69101
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Reference: blender/blender#69101
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System Information
Operating system:Windows7
Graphics card: gtx1050ti
Blender Version
Bug:2.80 (release)
Short description of error
Information about the position of objects is obtained in a different way for the viewport and render when working with drivers
The position of the dummy in the viewport is taken from its past state. When rendering from the frame on which the viewport was standing.
Exact steps for others to reproduce the error
1.create a cube
2.create a dummy (or another cube)
3. Set for dummy driver in the X position
4. Script expression: (bX + aX) /2
Variables:
[bX is the position of the dummy on the x axis]
[aX is the position of the cube on the x axis]
5. create an animation on x axis for target cube
6. play in vievport
7. play in render
p.s. Rendered animation https://youtu.be/1HdPOXR1qCs (sound driver's work's right but render isn't) planks on sides must indicate acceleration (in vievport its right) indicators on front sides must indicate drift.
p.p.s I offer 2 solutions: 1. take the position of objects for drivers from their position in the last frame. 2. add the parameters "speed"(local and world space) and "acceleration"(same) to the properties of object's in drivers tab.
Added subscriber: @Chalouek
Position in render and veivport bug. (Driver properties)to Position in Render does not match viewport. (Driver properties)Added subscriber: @lichtwerk
Since it takes time for each developer the recreate your setup, please provide your .blend file here, so we can reproduce.
Thx in advance.
Driver.blend
Added subscriber: @Sergey
Hi there (and sorry for the massive delay in the reply)!
This issue looks like a dependency cycle.
The drivers variables are set up as
Transform Channel
types (and thus the dependency cycles are not reported, see below)If I set the variables up as
Single Property
types (no functional change), you get the dependency cycles reported:Driver_single_property.blend
So having dependency cycles is not considered a bug.
See #72899 (Animation driver takes data from previous frame) on why these are not reported for
Transform Channel
driver vars:In the end, this looks like a duplicate of #64793 (Bone driver leading to cyclic dependency (used to work in 2.79)) as well...
Closed as duplicate of #64793