Am 31.01.21 um 15:21 schrieb Doug Moen:
In 3 of the procedural 3D graphics programs I have installed, there
is a $time variable that gives the duration in seconds from the
beginning of the animation. You can trivially use it to move an object
at a constant speed, independent of variations in the frame rate during
animation. In my limited experience, OpenSCAD is unique in not
providing this variable.
Bassklampfe, it sounds like your problem would be solved if there
were a $time variable of the kind I described.
There are two different requirements from my sides, which can be solved
by different solutions
Requirement 1: Given distance (or rotation) by frame.
This could be solved by a $frame variable by itself of by a $numframes
variable using $t*$numframes
Requirement 2: Given speed/second independent of frames per second.
$time would help me, but without $numframes I do not know, how long the
animation will last.
Concrete example: Animate a car, which will speed up for the first 2
seconds of an animation, then drive (e.g. in a circle) with a given
speed, as long as the animation lasts, but will speed down for the last
2 seconds, so it is stopped again at the end.
making $numframes /and/ $fps (which are both entered in GUI) available
in the scad script would give me all information to do the required
calculations. $totaltime could be calculated by $numframes/$fps, $time
could be calculated by $t*$totaltime
Am 31.01.21 um 15:21 schrieb Doug Moen:
> In 3 of the procedural 3D graphics programs I have installed, there
is a $time variable that gives the duration in seconds from the
beginning of the animation. You can trivially use it to move an object
at a constant speed, independent of variations in the frame rate during
animation. In my limited experience, OpenSCAD is unique in *not*
providing this variable.
>
> Bassklampfe, it sounds like your problem would be solved if there
were a $time variable of the kind I described.
>
There are two different requirements from my sides, which can be solved
by different solutions
Requirement 1: Given distance (or rotation) by frame.
This could be solved by a $frame variable by itself of by a $numframes
variable using $t*$numframes
Requirement 2: Given speed/second independent of frames per second.
$time would help me, but without $numframes I do not know, how long the
animation will last.
Concrete example: Animate a car, which will speed up for the first 2
seconds of an animation, then drive (e.g. in a circle) with a given
speed, as long as the animation lasts, but will speed down for the last
2 seconds, so it is stopped again at the end.
making $numframes /and/ $fps (which are both entered in GUI) available
in the scad script would give me all information to do the required
calculations. $totaltime could be calculated by $numframes/$fps, $time
could be calculated by $t*$totaltime
