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Questions tagged [perspective]

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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 ...
neat's user avatar
  • 71
4 votes
0 answers
174 views

Project grid on 2d plane based on camera perspective

Unsure if this is the right network to post this, but maybe someone can help... I'm working on a personal project where, with the help of AI, I want to automatically estimate the perspective of a ...
Chris's user avatar
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4 votes
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Is it possible to create a forced focus with a dual layer of images in order to Avoid eye strain with Virtual and Augmented Reality?

Would eye tracking allow for the alignment of a dual layered image (a google glass like device and a screen or projection) to provide a way to force the focus of the eyes into to a real life ...
Ryan's user avatar
  • 41
3 votes
0 answers
94 views

What vergence angle is commonly used for "infinitely far away" objects in stereoscopic displays?

I think that VR / AR experts will know the answer to this. At what vergence angle are "infinitely far away" objects such as star field textures drawn in head-mounted VR / AR displays ? I ...
Simon's user avatar
  • 183
3 votes
0 answers
215 views

Calculate Camera parameters and HandEyeCalibration

I'm trying to calculate camera paramters and a hand eye calibration (Transformation from camera to eye (display) coordinates) for rendering on a see-through HMD. I have already calculated a ...
user2479595's user avatar
3 votes
0 answers
86 views

Bilinear Transformation not working

I implemented this algorithm to fit given image to specified quadrilateral but the output is blank. I implemented it in C# as follows ...
Sandiip's user avatar
  • 173
2 votes
0 answers
88 views

Can anyone tell me why my projection perspective matrix isn't working?

I'm a beginner in WebGL and graphics programming in general. I'm trying to render procedurally generated terrain. My first stab at this seemed to work and I get the following result. I want to add ...
Andrew Lubrino's user avatar
2 votes
0 answers
204 views

physics/math of lighting gradient of a 3D object

Consider a monochrome ball. The colours of the pixels is a function of the point height, the light intensity, the light angle, and the surface material (reflection). What is the simplest formula ...
Googlebot's user avatar
  • 131
2 votes
0 answers
78 views

Project a Square as rectangle in projection plane using perspective projection

Consider a square S with vertices (1,1,0), (1,-1,0), (-1,-1,0) and (-1,1,0) and a plane P defined by $z=1$. Let the perspective projection of S on P is denoted by S'. What coordinates of the Center ...
Leolime's user avatar
  • 121
2 votes
0 answers
214 views

How to calculate solid angle subtended by a pixel?

How is the solid angle subtended by a pixel calculated? both in perspective and fish eye lens.
ali's user avatar
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2 votes
0 answers
285 views

Using GPU instead of CPU in Scala

I wrote a program that displays points expressed in 3D in a 2D canvas, using perspective projection. The aim is to display a cube. Each face of the cube is drawn by linearly interpolating the points ...
JarsOfJam-Scheduler's user avatar
2 votes
0 answers
261 views

How to project a view frustum in an orthographic cuboid?

I know that OpenGL uses a projection matrix to project the view frustum directly into the canoical volume [-1, 1]^3. But how would I project the frustum into an orthographic cuboid, which would then ...
imc's user avatar
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2 votes
0 answers
66 views

Perspective Translation Of Quadrilateral

I have mapped four rectangular point(R1->R4) to four quadrilateral points(Q1->Q4) to generate a perspective view. Now I have to translate quadrilateral in x and y direction while maintaing perspective ...
Sandiip's user avatar
  • 173
1 vote
0 answers
34 views

How to get back project point cloud from rendered rgbd images by rgbd?

Given a sequence of RGB-D images rendered by blender and the camera parameters for the blender camera(Perspective Projection camera). How can I back project the RGB images with depth map to a RGB ...
Goatz's user avatar
  • 11
1 vote
0 answers
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A fresh perspective confusion about a paragraph

I am trying to re-implement the paper "A fresh perspective" In this paper there is one paragraph on secion 2 that reads: Usually, $z_s = z$ is the depth value of the point $P$, unchanged by ...
Makogan's user avatar
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1 vote
0 answers
64 views

Inverting perspective projection doesn't yield frustum?

I have a cube with 8 vertices representing the $[-1,1]^3$ cube vulkan uses for device coordinates. The perspective projection matrix takes a frustum and maps it onto this cube. It thus makes sense ...
Makogan's user avatar
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1 vote
0 answers
87 views

Mapping a box to an inverse frustum

I have a non AA, non cubic, box living happily in 3D. I have a frustum defined by 2 squares. one square is the square defined by [-1, 1]^2 and the other square can have any size, there is also a ...
Makogan's user avatar
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1 vote
0 answers
47 views

How to get "Equal" (saturation, brightness) Red and Green Colours in a Web-based Application?

I am looking for a red and a green hue that are equally discernable against a gray background on any PC monitor, using HTML/CSS-based application. There are many possible solutions to balance these ...
Kiki Kawai's user avatar
1 vote
0 answers
45 views

3D reconstruction using 2D matched points

I have 2 images, called left and right images. I have some matched points $[c_l,r_l]$ and $[c_r,r_r]$ in both of them (these points are in pixel coordinates). For a 3D point in the real world, they ...
Koe Koe's user avatar
  • 11
1 vote
0 answers
220 views

image warping, given the rotations/translations

in OpenCV there is functions to warp any 2D image using a homography matrix (3x3), e.g. cv2.warpPerspective. These matrices are generally constructed using point ...
Cookie's user avatar
  • 111
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9 views

Name of non-standard perspective projection where parallel lines do not meet at a single vanishing point

I have made a non-standard perspective projection for a rectangular room (see left figure), in which for stylistic reasons, I chose to make the perspective "width" of the walls equal ...
eziama's user avatar
  • 1
0 votes
0 answers
36 views

3D engine projection distortions

I'm trying to write my own 3D engine using Python and Pygame. I have successfully implemented rotation and projection matrices to display 3D models. However I am so far unable to implement translation ...
Zoler1337's user avatar
0 votes
0 answers
63 views

Camera Perspective of 2D X/Y Plane

I'll start with the coordinate system I'm trying to use: If I were standing on the ground, facing north, the x axis is a line moving from the west to the east (positive X is east). Positive y is ...
Helpful's user avatar
  • 101
0 votes
0 answers
78 views

Using Perspective Rendering To Render A 3D Point

I am wondering how I can use perspective rendering to render a point onto a screen. An image showing perspective rendering: Say I have a 3d point (with x, y, and z coordinates), a point for the ...
Brendan R.'s user avatar
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0 answers
642 views

how is zooming done in computer graphics

Since a projection plane and a center of projection is used for achieving perspective projection, the shape of the view frustum doesn't change changing the focal length(which is the distance from the ...
juztcode's user avatar
  • 117
0 votes
0 answers
121 views

Issue with perspective projection

I have the following problem. Perspective projection is often referred to when talking about camera models. I don’t think I understand it very well though this concept is taught when I was at junior ...
fatestayn's user avatar