Dimensions of default marker need to be changed

[bdm]

In Celestia 1.4.1, stars of a certain brightness (when rendered as scaled disks) appeared to be square when centred, taking up 2 x 2 pixels. The default marker was consistent with this, being a diamond of 10 x 10 pixels. Both dimensions were even numbers.

In Celestia 1.5.0, the shape of the stars changed so the centre of the star was a single pixel; stars that were 2 x 2 pixels now appear as a cross of five pixels. However, the default marker is still a diamond of 10 x 10 pixels. When the marker marks a centred star, the marker appears off-centre.

To be consistent, the default marker needs to be changed to a 9 x 9 or 11 x 11 diamond.

(This may have been corrected in a more recent version but 1.5.0 is the latest version that I have installed at the moment.)

[selden]

What is the "certain brightness"?
Can you provide a URL which demonstrates this problem?

I'm not seeing it on my Windows system running any version of Celestia but I'm not sure I'm looking at things right.

[edit]

1. v1.6 uses an entirely different type of indicator to show which object is selected. I'm not sure if that's what you mean by "default". The new marker is animated.

2. When one "marks" a dim star in v1.6 the resulting green diamond seems to be offset somewhat, but this is the case for both scaled discs and fuzzy points. "Star style: points" does draw stars centered in the diamond. The diamond doesn't move, so this suggests to me that the problem is in the position where stars are drawn in the other two styles, not in the position of the marker.

[bdm]

What is the "certain brightness"?
Can you provide a URL which demonstrates this problem?

Sorry for not providing enough info in my original post, as it was a hot summer's day and was felling a bit grumpy from the heat.
Primus Hyadum
Star style = scaled disks, limiting magnitude is 6.64. However, exact brightness of the star is not important because they all appear off-centre.

1. v1.6 uses an entirely different type of indicator to show which object is selected. I'm not sure if that's what you mean by "default". The new marker is animated.

This suggests to me that the issue may be an old issue.

2. When one "marks" a dim star in v1.6 the resulting green diamond seems to be offset somewhat, but this is the case for both scaled discs and fuzzy points. "Star style: points" does draw stars centered in the diamond. The diamond doesn't move, so this suggests to me that the problem is in the position where stars are drawn in the other two styles, not in the position of the marker.

The following is what I get with the above URL and settings. I have magnified the image by 16 times for convenience.

scaled-disk.png

It is clear from the above image that the marked star is off-centre within the marker. The star would be centred within the marker if the marker was enlarged in size by 1 pixel in both directions and the marker retained its position relative to the top left of the star:

scaled-disk-new.png

[bdm]

Here is the same star with points selected:

points.png

Here is the same star with fuzzy points:

fuzzy-points.png

2. When one "marks" a dim star in v1.6 the resulting green diamond seems to be offset somewhat, but this is the case for both scaled discs and fuzzy points. "Star style: points" does draw stars centered in the diamond. The diamond doesn't move, so this suggests to me that the problem is in the position where stars are drawn in the other two styles, not in the position of the marker.

This looks similar to what is happening in the older version. Note how the middle of the star is placed 1 pixel down and right when fuzzy points and scaled disks is selected, compared to its position when points is selected.

[selden]

As best I can tell, exactly the same problem is present in v1.6

[ElChristou]

This is a really tiny detail, but yes in the absolute, this need to be fix...

[bdm]

There are actually two issues here. There's the marker issue I raised, and also the issue that Seldon mentioned where the middle of the stars appear to be plotted in different places. The middle of the stars in all rendering modes and the middle of the markers should all coincide at the same x,y co-ordinates. In 1.5.0 they do not.