Request for oblique projection lens camera

let's support this idea, it's really useful

The advantage is you still can find sizes just measuring the image

@Jason van Gumster: Yes a new Lens like "Perspective, Orthographic, Panoramic"

@Josh Strawbridge: useful on video games and architecture

@daltomdesigner: video games maybe but i'm not so sure about architecture.

Arch viz is part of my job but i've never had the need or even the thought that i might want to use an oblique view. i'm not saying that it wouldn't be useful for certain situations but architecture isn't one of them.

my initial thoughts for it's uses would be for things like stylized maps and assembly drawings (like in instruction manuals).

so for me that'd be mostly just part of the process of creating textures for other things i'd like to make. like background clutter in some sort of tinkerer's workshop or adventurers looking over a map in a tavern or something.
so initially it may take more time for me to use an oblique view and render out the image i want because i'd have to create all the stuff in blender to place on the map or assembly drawing / engineering blueprint looking thing but overall it does mean i'd be able to build a library of assets for that sort of thing and create them faster later on. it also means that those assets don't have to be specifically used only to get the map or assembly drawing. the tinker could be working on the same assets used to make the assembly drawing and the adventurers could later be placed in the middle of the assets used to make the map.

not trying to be against your proposal, after some thinking about it i do think it's a good idea but you really don't go into any detail as to why this is useful to get other people excited about the idea or to understand why it should be implemented. what you've done here is basically go "i want this" and expect that everyone will think it's a good idea without anything to convince them.

think up some uses for it to really convince others of your request and add them to the request.

* @Josh Strawbridge * I think this feature would be very interesting for architecture. I work with blender as an architect and use to teach blender to architecture students at university for about 8 years. Blender is not initially meant for architecture and that's why I find it interesting to use.

Oblique projection would be very useful in my point of view. This kind of drawings offers a lot because, despite its "deformed" style at first sight. It brings up a direct 3d transposition of a plan view. It also refers to an historical practice of drawing (for example, the ones of Auguste Choisy french architect of the 19th century). Architects around me are more and more interested in a kind of revival of those kind of drawings. I already used blender to produce some oblique projection drawings with the usual tricks: deformed instanced copy rendered from top view camera, pixel aspect ratio deformation on an otho camera,... I also build up with a colleague a node set with the svershock add on a few years ago in order to control the deformation of the geometry..

A friend of mine is trying to build up an add-on on the base of a script we wrote a few years ago creating an otho camera in the right orientation and setting up the pixel aspect ratio for the render:

import bpy
import math
from math import radians
from math import cos
from math import sin
bpy.ops.object.camera_add()
myScene = bpy.context.scene.render
myAxoCam = bpy.context.object
myAxoCam.data.type = 'ORTHO'
myAxoCam.data.ortho_scale = 10
angleZ = radians(30) #rotation angle of camera in Z en degre
angleZ_XY = radians(45) #angle between camera and groung (XY plan) in degre
myAxoCam.rotation_euler = (angleZ_XY, 0.0, angleZ)   
myAxoCam.location = (10, -10, 10*1/cos(radians(45)))
myScene.pixel_aspect_x = 1/cos(angleZ_XY)

This is just a python noob solution.. The problem is that the view in the UI viewport is not deformed as in the render by the pixel ratio and the camera angle cannot be interactively modified after creation.

We thought about "deforming" the UI 3D viewport window in Y axis interactively, but couldn't find how. If any of you as an idea of how we could make this possible, please feel free to reply !!!

A small but update for my previous post : My collegue and friend Julien turn this piece of code into a small add-on you can find here : codeberg.org/AlICe_lab/pohlke I made a small video to explain why we did this and how to install it. It is available here : codeberg.org/AlICe_lab/pohlke/media/branch/master/media/pohlke_oblique_projection_camera_addon_showcase.mp4 Hope this will help!

Hi, I posted this first where I saw the post on BlenderNation but then I saw the link to the discussion here:

Thanks, that's good! One question, and I'm sure it must be just about terms and conventions.

Comparing your views to the views presented in Wikipedia's page on Orthographic Projection and the diagram "Comparison of several types of graphical projection" your Cavalier view is more like their Military Oblique Projection which retains the XY plane and rotates it 45 degrees. This Military Projection puts a visual emphasis on the plan form.

The Cavalier, in Wikipedia, keeps the XZ plane and rotates the Y 45 Degrees. This visually emphasizes the vertical plane or Elevation. This is shown in the page you linked to aseriesofrooms:

• Qiu Ying Saying Farewell at Xunyang
• Ettore Sottsass Casa molto normale
• Qiu Ying Spring Morning in the Han Palace
• The Grace of Kasuga Gongen
• Nathalie du Pasquier
• Jacques Androuet du Cerceau
• Gabriel Muffel

(There are also variations like the Top-Down Oblique (Tigerman-McCurry, Alessandro P Arienzo S, page from the Shahnama) where the Y is at 90 degrees.

Also I think Cabinet projection refers to a variation of the Cavalier projection (as described by Wikipedia) where the Y axis projection is shortened by 50% or 75% depending upon the convention and is not how you seem to have it.

Was it not possible to get Blender's camera to make these views?

Hi @LJSilver. Thanks for your interest in this matter. You're conclusion is correct. Conventions and namings are sometimes a bit confusing but blender has indeed no oblique projection camera.