[OpenFOAM] Perspective vs Orthogonal in paraFoamparaview

kai · October 2, 2008, 04:38

Hi all

I find that all my results draw by paraview are "Perspective View". For example, for a framewire cube, when I put one of its surface parallel to the screen, I always see all the edges because of the perspective effect.

Now I want something in "Orthogonal View", the same in CAD programmes, i.e. in OpenGL, I want a result using glOrtho() instead of glPerspective().

How can I achieve this? Any advice is appreciate.

Kai

thomas · October 2, 2008, 04:58

Dear Ka Liu,

on left top of the main window,in which your model is viewed, are some small buttons. You can change the projection method in one of them, I think the 2nd from the right.

Thomas

kai · October 2, 2008, 05:28

Hi Thomas

Thank you for your help. I didn't know this kind of thing is called "Parallel Projection" in paraview. Now I get what I wanted.

The location of the toggle is "Edit View Options"-->"Gerneral"-->Use parallel projection.

Best wishes,

Kai

lenzo · June 30, 2017, 06:55

Hi there!

This post is from 2007, but now I am in the same trouble, using a paraView 5.0.1 64-bit.

I can't really find this "Edit View Options"-->"Gerneral"-->Use parallel projection. ""

I have checked the users guide and there is no such thing....

I start to think that they decided that it was not sth useful...

lenzo · June 30, 2017, 06:59

OK, sorry. I have just realized that it's a toggle where swaps between 2D and 3D.

Thankyou!

akidess · June 30, 2017, 07:35

There is a little button labeled "3D". It can toggle to 2D. This is what you are looking for. Note that the toggle does not trigger a redraw, you need to do this yourself (e.g. by zooming).

Edit: Somehow I missed your update.

louisgag · March 10, 2018, 09:08

In the latest paraview versions (example: 5.4.1) to switch to 2D viewing mode, you can tick the Camera Parallel Projection checkbox under the Orientation Axes header of the Properties panel in the pipeline browser.

Hope this can help

-Louis

lenzo · June 29, 2018, 07:14

Quote:

Originally Posted by louisgag

In the latest paraview versions (example: 5.4.1) to switch to 2D viewing mode, you can tick the Camera Parallel Projection checkbox under the Orientation Axes header of the Properties panel in the pipeline browser.

Hope this can help

-Louis

THANK YOU. That's exactly what I was searching for!!!
I attach an image to make it clear

October 2, 2008, 04:38	Perspective vs Orthogonal in paraFoamparaview	#1
kai New Member Kai Liu Join Date: Mar 2009 Location: Beijing, China Posts: 6 Rep Power: 17	Hi all I find that all my results draw by paraview are "Perspective View". For example, for a framewire cube, when I put one of its surface parallel to the screen, I always see all the edges because of the perspective effect. Now I want something in "Orthogonal View", the same in CAD programmes, i.e. in OpenGL, I want a result using glOrtho() instead of glPerspective(). How can I achieve this? Any advice is appreciate. Kai lenzo likes this.

October 2, 2008, 04:58	Dear Ka Liu, on left top of	#2
thomas New Member Thomas Gallinger Join Date: Mar 2009 Posts: 28 Rep Power: 17	Dear Ka Liu, on left top of the main window,in which your model is viewed, are some small buttons. You can change the projection method in one of them, I think the 2nd from the right. Thomas

October 2, 2008, 05:28	Hi Thomas Thank you for you	#3
kai New Member Kai Liu Join Date: Mar 2009 Location: Beijing, China Posts: 6 Rep Power: 17	Hi Thomas Thank you for your help. I didn't know this kind of thing is called "Parallel Projection" in paraview. Now I get what I wanted. The location of the toggle is "Edit View Options"-->"Gerneral"-->Use parallel projection. Best wishes, Kai ilhado likes this.

June 30, 2017, 07:35		#6
akidess Senior Member Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,377 Rep Power: 29	There is a little button labeled "3D". It can toggle to 2D. This is what you are looking for. Note that the toggle does not trigger a redraw, you need to do this yourself (e.g. by zooming). Edit: Somehow I missed your update. lenzo likes this. __________________ On twitter @akidTwit Spend as much time formulating your questions as you expect people to spend on their answer.

March 10, 2018, 09:08		#7
louisgag Senior Member Louis Gagnon Join Date: Mar 2009 Location: Stuttgart, Germany Posts: 338 Rep Power: 18	In the latest paraview versions (example: 5.4.1) to switch to 2D viewing mode, you can tick the Camera Parallel Projection checkbox under the Orientation Axes header of the Properties panel in the pipeline browser. Hope this can help -Louis lenzo likes this.

June 30, 2017, 06:55		#4
lenzo Member Lenzo Join Date: Feb 2014 Posts: 33 Rep Power: 12	Hi there! This post is from 2007, but now I am in the same trouble, using a paraView 5.0.1 64-bit. I can't really find this "Edit View Options"-->"Gerneral"-->Use parallel projection. "" I have checked the users guide and there is no such thing.... I start to think that they decided that it was not sth useful...

June 30, 2017, 06:59		#5
lenzo Member Lenzo Join Date: Feb 2014 Posts: 33 Rep Power: 12	OK, sorry. I have just realized that it's a toggle where swaps between 2D and 3D. Thankyou!

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