Corner radius results in a huge difference when using isometric grids

[pentool]

Hello,

I am curious what is the reason that the corner tool gives quite a huge difference for different corners in isometric layout, even if I use the same corner values. I have attached a screen recording of the issue.

1. Create an isometric grid (regular or 2:1 ratio - doesn't matter)
2. Set the grid size to 100px
3. Set the grid division to 4. This would make every small division 25px.
4. Use the Pen Tool to draw a square, by snapping its corners to the grid.
5. Use the Corner Tool and set the radius for the top and bottom vertices to 25px.
6. Use the Corner Tool and set the radius for the left and right vertices to 25px as well.
7. Since the grid size is 100px and the subdivisions are 4 (= 25px), shouldn't the radius for the 4 vertices be the same (or at least close)? Yet, the left and right vertices result in a WAY greater corner size.

Could anyone tell me why this is? Please check out the attached screen recording.

Thanks.

 

ADesigner 1.8.3

macOS 10.14.6

[pentool]

The correct way to transform an object (let's say a square) in the top isometric view is:

1. Scale the object vertically 86.6%
2. Sheer the object 30 degrees
3. Rotate the object -30 degrees

With this, I get the correct result in Illustrator, with correct corner radiuses. In ADesigner, I am not even getting the correct transformation (even if I try to do this manually), let alone the corner radius. So something is really off here.

[GarryP]

Yes, this does look strange.
Even when using the Isometric Studio, the corners seem to come out larger/smaller than expected.
See attached video where the baked corners come out as different sizes to the non-baked ones.
The left/right non-baked corners are smaller and the top/bottom non-baked corners are wider.
This doesn’t seem right but I couldn’t say, without drawing it manually, which is correct.

[firstdefence]

Adobe Illustrator does the same thing, although they have relative and absolute options, with absolute selected in the screenshot.

Relative just pushes the corners out a smidge.

Relative deviation shown in red.

[GarryP]

What does it look like in Illustrator with Relative set instead of Absolute?

[firstdefence]

2 minutes ago, GarryP said:

What does it look like in Illustrator with Relative set instead of Absolute?

I “red” your mind lol!

[GarryP]

So it looks like we get something like (but not exactly the same as) Illustrator’s Absolute setting when the corners aren’t baked but something like (but not exactly the same as) Illustrator’s Relative setting when then corners are baked.
Does that sound like what’s happening to you?

[pentool]

Unfortunately, Illustrator doesn't have a grid system "generator" like ADesigner does. So in Illustrator I used actions so far to create various axonometric views (dimetric, trimetric, isometric, etc). Here I had to first create the top/left/right views and use the actions to transform them accordingly.

I was happy to see that finally ADesigner's grid system is working and was hoping to easily create designs in various axonometric views. I was under the impression that I should be able to round corners after I projected the shapes, but of course that is not the case.

In Illustrator I first create the correct top/left/right shape and then do the transformation. I was hoping I can adjust the shapes in ADesigner after the transform, but apparently that is not the case - after all, it is not a 3D program. Oh well... it seems I will have to create the correct shape frst in ADesigner as well, and then do the transform.

[GarryP]

You can use the Corner Tool after you use the Fit To Plane functionality of the Isometric Panel. However, the corners will still have the issue as before.
We need to know whether the corners should look like as they do before baking or as they do without baking. Illustrator seems to have Relative and Absolute corners but I have no idea what the difference is or which is ‘correct’ in this situation.
If we can find out what the corners should look like when viewed isometrically we can then say whether Designer is doing this correctly or not. Without knowing what should happen we can’t say whether it’s being done wrong or not.

[pentool]

It's interesting that when I use the Rounded Corner Rectangle Tool, then it does create the correct corners regardless whether I set the corners first and then do the transformation, or I to the transformation first and then adjust the corners. I think the Corner Tool should work the same way.

[firstdefence]

This is an interesting youtube video demonstrating isometric curves/corners. I’ve started it it at the top section when creating a circle.