TopDown properties enforced

[PascalLadalle]

• [x] FIXED IN https://github.com/4ian/GDevelop/pull/4764 The default rotation speed (180) always comes back if one tries to change it in the behavior editor.

• [ ] The custom isometry angle seems limited from 0 to 45, not sure if that's normal.

• [ ] The field "movement angle offset" adds 45 to the current value when Top-Down viewpoint is chosen. I guess it should set a default value of 45, but again, not sure if that's normal.

GD5v154

[AlexandreSi]

Hi @PascalLadalle, Thanks for spotting this!

Here is my conclusion:

• Rotation speed setting will be fixed by my PR
• Custom isometry angle needs to be between 1° and 44° so I added the range in the label (but i'm not sure why)
• The 45 offset seems to be normal (at least it was coded as so). I think it makes sense when using normal values for the angle offset.

In general, unless one has already worked a lot on these angle issues for isometric games, these parameters are super hard to understand. I think it needs a playground or at least a wiki article about this. @D8H I see that you made the change regarding the 45° offset. Do you think there's a way to better explain those settings?

[D8H]

• The custom isometry angle seems limited from 0 to 45, not sure if that's normal.

This is the angle between the diamond edge and the horizontal axis:

• 0° would mean that a cell is infinitely wider than higher
• 45° is a top-down viewpoint, formulas for isometry doesn't work with this value

• The field "movement angle offset" adds 45 to the current value when Top-Down viewpoint is chosen. I guess it should set a default value of 45, but again, not sure if that's normal.

Actually, it's the other way: -45° is added for isometry. Isometry rotate the viewpoint from 45°, so the left-right and top-bottom axis are in diagonal. It's rotated to put back the axis horizontally and vertically which is often easier for players.

But maybe it wasn't a good idea to do the 45° rotation in the 1st place. Florian suggested to just scale the Y but I was a bit blinded by another feature that needed it this way (though this feature will never come out).