Warp Perspective

Good morning everyone.
This is my first post.
Is there in LibreCad a warp perspective tool?
A workaround too.

Thank you

Angelo

Currently, no.

Of course, if you want to construct perspective manually, we have enough line methods for that.

I think that's a very interesting method to add:

1, perspective of conic sections are conic sections, so we have enough geometry primitives for the method;
2, I have started to add a new skew method, and only the engine supprt is implemented so far;
3, we can add those two methods together completing our projection support: with skew for orthogonal.

Angelos58 wrote

Good morning everyone.
This is my first post.
Is there in LibreCad a warp perspective tool?
A workaround too.

Thank you

Angelo

https://heikell.fi/downloads/LibCAD_220rc1.pdf has a manual example.

What exactly do you want to use this for?

I want to support conic sections as well

flywire wrote

https://heikell.fi/downloads/LibCAD_220rc1.pdf has a manual example.

Thank you very much for link.
A lot of interesting issues.

Is there also tutorial for wrapping perspective a shape? For example a circle.

Not really a tutorial.

In LibreCAD, there's a drawing method to create an inscribed ellipse of a generic quadrilateral. The algorithm is based on:

A quadrilateral is a perspective of a square;
Finding the inscribed circle of a square is trivial;
The perspective of this circle gives the inscribed ellipse of the quadrilateral;
so the ellipse is found from the perspective of a circle.

My goal is to implement a way to allow specifying a perspective transform from GUI, and transform any selected entities (point, line, circle, ellipse, parabolas, splinepoints, cubic splines(need to verify the math)) to their perspective projection.

Angelos58 wrote

Thank you very much for link.
A lot of interesting issues.

Is there also tutorial for wrapping perspective a shape? For example a circle.