Indigo Renderer Forum

In architecture, we usualy use the 2 Point Perspective, and SketchUp have this feature.
But when I export with SkIndigo, I loose my point of view and the result is a wider angle view with no vertical perspective. In this view, I can crop to have my initial view, but I need to render a bigger image to find the right view.



I thought this feature was not aviable in Indigo, but when I did the same in C4D, Cindigo export the right view.
I searched in the Cindigo .igs exported file, and I found lens_shift_up_distance.

I dont know how SketchUp define 2 Point Perspective view and if it's easy to convert in lens shift up Indigo value, but it will be a nice thing to have this feature in SkIndigo...

What you have to do is narrow a lot the fov (zooming out the image in the process)... at least that's how I do to achieve it

... Narrowing the fov reduce ALL perspective.

In the view I posted, the horizontal perspectives are visible, but the vertical one is canceled, and the camera is at human eye height. It's just like a shift lens in photography : the camera is horizontal and the shift lens allow to target up or down without vertical perspective.



1- normal camera at eye height looking up to see all the building (vertical perspective )
2- normal camera heigher to look straight horizontal to cancel vertical perspective (flying camera )
3- normal camera at eye height looking straight (not all the building and too many ground )
4- shift lens or 2 points perspective (eye height view, no vertical perspective, see the whole building :))

This is a very usefull feature in architecture, with real camera or 3d soft.
Sketchup can do it, Indigo can do it too... but it missing in SkInogo to make the link
I tried to add the lens_shift_up_distance in the .igs file, but it's realy hard to find (or calculate...) the right value.

Shift lens is supported since version 1.1.5. However, it is not possible to extract the shift_up_distance and shift_right_distance from the SketchUp API . You have to use trial and error to find the correct values.

There's a ruby that, amongst other things, lets you set the "tilt" of the camera. That's what you need. I forgot what it's called, though (can't check right now). You might want to ask over at Sketchucaion.

Hi Daredevil! I use two-points perspectives a lot in my work, and I usually use cameraparameters.rb to get it, more than the native sketchup two-points pespective. You know, two-points perspective is nothing more than a simple perspective in which your eye points directly straight, neither up or down.
So, with this rb you just have to set the Z value for your camera (position Z) and then copy it in the "Mire Z" slot (your eye height value).

Hope this helps you!

Thanks all for trying to find a solution

Pibuz wrote:You know, two-points perspective is nothing more than a simple perspective in which your eye points directly straight, neither up or down.

Not only ! In SketchUp, when you are in 2 points, you can move the frame (with hand tool) without tilt your "head", you cant look up or down without vertical perspective.
In my samples, the view #2 and #3 are straight view, with same Z for camera and target as you said, but the #4 is a "shifted", camera target is same Z but frame target is heigher.
I used it in real photography, so I want to have same tools in 3D . But unlike SketchUp, in real photography, we can keep little vertical perspective for nice result. A wikito explain. I think I will make a page for this feature in the Indigo wiki...

I'm not a programer, so I cant realy test all, but (after hollidays ) I will try to explore the cameraparameters.rb and the SketchupCamera Class to see if there is a solution. I want to find it !!!!!