Questions tagged [perspective]

An approximate representation, on a flat surface, of an image as it is seen by the eye.

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53 views

What is the alternative (new) 3d projection called that solves the stretching / zooming at sides of monitor?

I understand about camera's and projections etc, such that we have distortion and zooming when at the sides of the screen (exacerbated on 21:9 monitors), however a few years ago, in a Unity forum ...
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0answers
26 views

How and where to transform a Camera Frustum onto a tilted screen?

In rendering tutorials for perspective projection the assumption is that the rendering surface is perpendicular to the sight line. As shown here: How to accommodate for a screen that is tilted ...
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2answers
82 views

How to avoid the cutoff of a Sprite when overlapping in a terrain?

I have a scene where I have a terrain as a PlaneGeometry. And I'm trying to locate a building on it as Sprite. But I'm not able to put that building/sprite centered on the terrain without getting a ...
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1answer
110 views

Difference between two perspective projection representations

When researching perspective projections on the web, I've come across two different representations. One is unrelated to OpenGL and the other is strictly associated with it. What is the relation of ...
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1answer
100 views

3D Perspective issues

My team is currently developing a 3D Sidescroller game and we encountered some issues regarding the whole in-game perspective of the levels. The levels are composed of 3D modeled corridors which are ...
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1answer
606 views

How can I emulate Diablo 3's Isometric view using Perspective?

Using DX11, SimpleMath I am building a isometric game like Diablo 3 in 3D and I want to use a perspective camera that emulates their top down view. Projection Matrix: ...
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2answers
806 views

Finding the normals of the planes of a View Frustum

Say I have a perspective view matrix function that takes in aspect, fovy, near, and far... Transforming the view into a frustum. Typical OpenGL stuff, right. But say then, that I would like to find ...
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1answer
822 views

Assigning sprite to a sorting layer through scripting

I have few prefabs with sprites which I want to assign to different sorting layers. How can I do it? I am also wondering if sorting layers matter if I use a perspective camera. Do they?
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2answers
426 views

How do I get from orthographic to perspective?

I programmed a cube in java and calculated the x y and z position for it's rotation on the x,y and z axis but I'm finding it hard to display the z axis i've been trying to change the distance of the ...
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1answer
304 views

Simulating a real camera's perspective projection

I'm trying to simulate a real camera's perspective projection of straight, parallel lines running along the ground (one-point perspective) by mapping the real-world 3D coordinates of the lines to 2D ...
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1answer
633 views

When does OpenGL Perform Perspective Divide

When does OpenGL divide by W? Is this done automatically within the vertex shader? It is my understanding that the vertex shader outputs the final vertex position, so I presume no transformations can ...
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1answer
98 views

Perspective View using Spritesheets

I am creating a Top-View 2D game. However, the only way i can get a good view of the objects, such as houses, trees, is to make the game in orthographic view. The same way games such as Pokemon games ...
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1answer
54 views

Are there any math limitations on the near plane in a perspective matrix?

I've noted that if in the perspective camera I put near plane to a low number like 0.000001 and far plane to 1000 my render has ...
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1answer
46 views

Perspective projection in Open GL

I am trying to convert a 3d point into a 2d point using a perspective projection. I'm new to OpenGL and may not have fully understood how this works. How exactly do I calculate the near and far values?...
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1answer
338 views

Strange Light Angles in Unity

I'm quite sure that I'm missing something very simple here, but I'm a complete Unity noob and I absolutely can't figure out what I'm seeing. I'm trying to light a sphere from both sides, ...
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1answer
278 views

View “distortion” or “stretching” when looking up/down? (Software renderer)

I'm not sure distortion is the right way to describe this. I've uploaded a video to show you guys. Apologies if it's long, but I wanted to show the code as well as posting it here. https://youtu.be/...
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1answer
84 views

Moving an object extremely close to the camera at a constant speed makes it visually speed up

I have a quad in 3D space (a billboard in the real-world sense) that I want to move close to the camera so the user can inspect it. The quad is defined by the 3D coordinates of its four corners. To ...
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3answers
923 views

Box2D in 3D space

I am trying to combine a perspective camera with a box2D world using libgdx and I am having some problems getting the two to synch up. I want to do this so I can use 3D models but keep the game in a ...
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1answer
80 views

Rendering perspective independent polygons in perspective view

I am creating an editor where I have "grabhandles" that can be dragged to transform a primitive object. My problem is that I can't find the correct solution to show these grabhandles in a perspective ...
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0answers
51 views

Asymetric Perspectiv View

I am building a addon component that will show synthesized 3D view of the world (kind of FLIR camera simulation). The problem I am facing is that currently I am using Symmetric Perspective View with ...
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2answers
531 views

glm::perspective isn't working?

So I'm learning how to make games and program, and while trying to setup a projection camera using GLM in GFLW, this line of code refuses to work and I can't figuire out why. The code is in the image ...
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0answers
296 views

LibGDX limit the PerspectiveCamera for a FPS view

I'm using LibGDX and I'm trying to implement a FPS camera into my game. I'm not using the FirstPersonCameraController for multiple reasons: I don't want to touch to roll (only yaw and pitch), with ...
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2answers
536 views

How to fake a 3d character displacement by sprite scaling in GameMaker?

I want my 2D sprite to become bigger when moving down the screen (closer to the camera), smaller when walking away and to maintain the same size when moving left or right. The scaling along the y ...
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1answer
86 views

OpenGL Perspective Issue

I'm trying to troubleshoot a problem with my simple OpenGL test program, which I've written in C. I've written some math routines to do the matrix manipulation, but even after copying known working ...
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1answer
332 views

Unity - Static Camera Perspective, Walls Obscure Player

Pretty simple and common problem here. The world I'm designing is fully explorable, no invisible walls or tricks. It's presented as a single seamless area, a School complex with 9 buildings, some of ...
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1answer
829 views

Converting real-life perspective photos into orthographic view for texture creation

I'm struggling to find software that will enable me to take real life photos and make them "flat" (orthographic) for use in textures. Does anyone know of a reliable way to take perspective photos and ...
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1answer
557 views

How can I convert an orthographic camera to a perspective camera?

How can calculate perspective camera parameters from orthographic camera parameters (left, right, top, bottom, near, far)? Specifically I don't know how calculate the FOV for a perspective camera ...
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0answers
90 views

Perspective correct interpolation of normal values

I'm currently writing a software rasterizer and I'm at the point where I can draw arbitrary triangles with vertex colors and perspective correct texture mapping. I do point and directional lighting by ...
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0answers
237 views

I get weird perspective using GLM where the depth is flipped. Please help

The depth is rendered wrong and I can't figure out why. ...
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1answer
984 views

Perspective-Correct Texture Mapping

I am working on a small rendering engine for a personal project and I am having issues with the texture mapping part of it. It seems to work for some cases, but not for others. For example, when one ...
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2answers
748 views

OpenGL perspective matrix far plane

The near plane clips at exactly the value I set just fine but instead of clipping at 1000 the far plane clips at 1. Here is the code for the projection matrix: ...
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1answer
407 views

Replicating a worldspace sphere on screen space

I have quite some struggle with a post processing shader that I'm working on. I use Unity, and I have a shader in which I want to, in screen space as part of post processing, render a sphere that ...
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1answer
129 views

Selecting the closest point in perspective view mode

I'm trying to improve my algorithm for selecting points in perspective view mode (OpenGL/Qt/C++). The current implementation works as follows. The user clicks on a certain ...
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1answer
82 views

Camera horizontal shift

I want stretch my game on two monitors. I use Unity 5.3. This version support the multi-display. But, one camera = one monitor. So, have two perspective cameras (at the same position). I search a "...
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1answer
125 views

Last Row of the perspective projection matrix

Could you explain to me what is the purpose of -1 in the last row of the gl_projection matrix? And how it affects the perspective division step ?
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0answers
115 views

Construction of perspective matrix

Is it possible to Construct a perspective matrix by multiplying a perspective transformation with a parallel projection ? I want a perspective projection in 2D space which is calculated by ...
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0answers
107 views

Perspective division by zero yields unexpected results

Usually, this is how a shape in clip space is defined: [0.25, 0.25, 0.0, 1.0] [0.25, 0.75, 0.0, 1.0] [0.75, 0.75, 0.0, 1.0] [0.75, 0.25, 0.0, 1.0] After ...
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1answer
704 views

Getting ray using gluUnProject or inverted MVP matrix

I've read a lot of topics here, on SO, opengl.org etc. Example how gluUnProject should work (from NeHe tutorial): ...
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2answers
277 views

Cursor position to a 3D ray using angles

I've been stuck for a month trying to get gluUnProject working. After my attempts to use gluUnProject failed (as well as attempts to implement gluUnProject functionality manually) I implemented method ...
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0answers
155 views

How does the SNES' Mode 7 sprite perspective projection work? [duplicate]

I've always wanted to know how to replicate the old Mode 7 graphics mode of the Super NES. It was frequently used for a pseudo-3D effect in racing games like Top Gear (gameplay video). Top Gear ⓒ ...
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121 views

Perspective projection

I'm studying Perspective projection in a computer graphics course and i'm really confused about a detail. The study material says there are 3 cases: Case 1: View plane parallel to the xy plane and ...
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2answers
682 views

Java OpenGL Perspective matrix not working

I'm trying to render a simple triangle with OpenGL in Java using LWJGL3. Everything is working great, but the projection matrix (perspective) is not working. In C++ I just used to apply the ...
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1answer
3k views

determining view boundaries based on z position when using a perspective projection

I'm using three.js to make an animation of a box moving around the screen in 3 dimensions. It is moving pseudo-randomly, according to a noise function. So, I want to place an invisible wall just ...
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2answers
1k views

How can I achieve a pseudo-3D camera effect like this?

I am trying to achieve a pseudo-3D camera effect similar to this: I have gotten the following results using a 3D camera and billboards: I am now running into the following problems: In the first ...
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0answers
173 views

Matching the 3ds max camera view in my game 1:1

I want to match 1:1 the 3ds max camera render with my 3d engine (DirectX 11, C++). I believe that my mesh exporter (coded with MaxScript) works fine, I see the ...
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1answer
2k views

2D game with angled top-down camera perspective [closed]

I want to create a game similar to binding of isaac, a slightly angled top-down 2D game. In binding of isaac, the character moves and shoots along a 4-way path, so when he is shooting towards East, ...
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1answer
1k views

What causes this distortion in my perspective projection at steep view angles?

For various reasons – partly educational, partly technical – I'm writing a 3D game engine from scratch, using OpenGL 3.0; aiming for Core Profile, eventually, so of course I'm using a custom matrix ...
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1answer
334 views

Perspective Projection - Drawing Lines

So I sort of understand the math behind projecting 3d points onto a 2d plane. It's just some simple dividing and multiplication of distances. However I can't seem to wrap my head around projecting ...
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1answer
1k views

LibGDX camera position shifted on movement

I'm programming a game with LibGDX and Box2D and I want my camera to follow my player. But as I zoom in (because Box2Ds metric system, using camera.zoom = x) the camera is shifted when the player ...
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0answers
347 views

How can I mimic an isometric perspective using square tiles?

Can an isometric perspective be mimicked with traditional square tiles? Can't the effects of the 45-degree overhead view simply be "drawn in" to the square? How would this work? Picture this: the ...