How to create (guide)lines that meet atvanishing point out of the screen?

[ss-kalm]

I'd put the vanishing points on the sheet where you need them (on the guideline layer), then draw the boxes small in the middle to the correct proportion, and the size them up as the last operation.

It's not the two vanishing points that makes them look strange, they are just not correct ... The angle between the boxes should increase not decrease.

[ernie-f]

Why not using the Isometric Grid?

[pepr]

Why not using the Isometric Grid?

This is rather nice comment, indeed! (Actually, I do not need the vanishing-point look for the icons.)

Thanks.

[ss-kalm]

Depends whether you really want a perspective or an isometric. There's a big difference.

[ernie-f]

Depends whether you really want a perspective or an isometric. There's a big difference.

I know this. But for the constrction it can be easier. Then you can do every deformation you need.

[Egg Bramhill]

This was a fun task. Here's my attempt. If anyone wants to know how I did it I'll be happy to do a tutorial.

[pepr]

@Egg Bramhill: This is nice -- also the shades of blue on the first picture. I do not know if the tutorial is not too time-consuming. Anyway, could you write the approach in bullets?

[pepr]

I was thinking about that. Thanks for the confirmation.

It's not the two vanishing points that makes them look strange, they are just not correct ... The angle between the boxes should increase not decrease.

Here I think we are on the same base. The problem is that the single box is drawn using two vanishing points. It is not correct to add the second only by copying with any offset. The reason is that after that there are actually four "vanishing" points. The related ones are not aligned. This is the reason for the strange angles.