View Issue Details
|ID||Project||Category||View Status||Date Submitted||Last Update|
|0001762||SkyChart||1-Software||public||17-08-31 14:31||18-10-03 09:51|
|Reporter||Michael Lewinger||Assigned To||Patrick Chevalley|
|Product Version||4.1 SVN|
|Summary||0001762: Animation rendering for milky way slow|
I like to produce movies such as this one (giving due credit, BTW): https://youtu.be/CTAVh4ppdWg. I use animation settings such as HD720, 15 sec between frames, and the overall result is very pleasant.
When the Milky Way is displayed in "fill" mode, frame rendering takes between **5 and 10 times** longer than when it is not displayed, or displayed in line mode. Obviously, animation takes much longer, but I imagine that people using CC for controlling telescopes suffer more than I do :)
|Tags||No tags attached.|
BTW, I have noticed few overlapped labels on your video (around 4:00). Perhaps that happens for some settings or particularly when make a video, however that is not welcome.
Can you be more specific about parameters?
Hi. I am not sure about the 04:00 overlapped labels, or what did you mean by "not welcome". I hope that I didn't make a bad impression on the Sky Chart program or its usage.
I use animation frames - 30 frames/sec, 15 secs interval between frames (x450 speed). When the milky way is displayed as fill in", such as in the movie shown, rendering of a 1 min movie (0000904:0001800 frames) takes a few hours. On the same computer, when milky way is presented as line only, it takes between 20 to 30 mins to produce the same amount of frames - about 10 times faster.
||It is just a note for Patrick to take a look additionally, nothing else. Overlapped labels are not welcome on the map. Attached screen shot with problematic parts.|
||Parameters for animation rendering|
||Parameters for milky way display|
Yes this milky way drawing is slow and this is why it is not activated by default even if it is nicer.
But it is probably possible to optimize the drawing speed, maybe by preparing in advance the milkyway "pixels" of different brightness instead of computing each one.
Sasa, the label overlap are because in Setup/Display, "Automatically optimize the labels placement" if off.
This is recommended for the animation to avoid "dancing" labels as the optimization algorithm is not stable and the label can jump from one side of the object to another between each frame.
Maybe a solution is to have an option to only suppress overlapping labels without trying to change their position.
Perhaps it is established general order for showing labels: constellation name, planets... stars, nebula? Or similar...
Is true, then perhaps is easy to keep list of shown objects started from first frame and add new only if do not overlap, within one second and then reset it when start second second of the video? Or perhaps within 250ms video duration...
That should work fine either when zoom or move.
Just a though.
I suggest to try to reduce label size when overlapping, to a minimum of readability (4 - 5 px ?). Or use different colors.
|17-08-31 14:31||Michael Lewinger||New Issue|
|17-09-01 12:42||Sasa||Note Added: 0003969|
|17-09-03 07:01||Michael Lewinger||Note Added: 0003970|
|17-09-03 09:12||Sasa||File Added: Overlapped labels on video.JPG|
|17-09-03 09:12||Sasa||Note Added: 0003971|
|17-09-03 09:33||Michael Lewinger||File Added: parms1.PNG|
|17-09-03 09:33||Michael Lewinger||Note Added: 0003972|
|17-09-03 09:33||Michael Lewinger||File Added: parms2.PNG|
|17-09-03 09:33||Michael Lewinger||Note Added: 0003973|
|17-09-11 08:53||Patrick Chevalley||Assigned To||=> Patrick Chevalley|
|17-09-11 08:53||Patrick Chevalley||Status||new => confirmed|
|17-09-11 08:53||Patrick Chevalley||Target Version||=> 4.2|
|17-09-11 08:53||Patrick Chevalley||Note Added: 0003974|
|17-09-17 11:09||Sasa||Note Added: 0004023|
|17-09-17 11:12||Michael Lewinger||Note Added: 0004024|
|18-10-03 09:51||Patrick Chevalley||Target Version||4.2 => 4.4|