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GLSL - draw image with equirectangular projection

How to debug a GLSL shader?Using both phong and textures in glslpitch yaw roll, angle independencyCalculate distortion in equirectangular projection on a sphereWrite to texture GLSLHow to draw orthographic projection from equirectangular projectionSimple GLSL render chain doesn't draw reliablyOpenGL : Rotate using roll pitch and yaw valuesInterpolate Color in GLSL Raytracerhow to return the mask of sampled pixels

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1

0

I'm trying to add a "sticker" on an equirectangular image.

The parameters I have are the angle of the sticker (yaw, pitch, roll), and its size in pixels, and the equirectangular image size (always a 2:1 ratio).

Example with this sticker (don't mind the background) :

If we put the sticker at the bottom of the sphere, the shader should be able to get something like this :

opengl geometry glsl 360-degrees 360-virtual-reality

share|improve this question

edited Apr 2 at 16:32

Xys

asked Mar 27 at 12:29

XysXys

35833 silver badges2020 bronze badges

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  I suggest using raytracing. If I understand the wikipedia page on equirectangular projection correctly, you can easily get ray directions from image coordinates (ray_yaw = x / image_w * 2 * pi and ray_pitch = (y + image_h/2) / image_h * pi or something similar). Then for each ray you just need to find a point where (and if) it intersects your quad (the math should be relatively easy to google).
  
  – HolyBlackCat
  Mar 27 at 13:47
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Shadertoy reference: shadertoy.com/view/MlfSz7
  
  – Ramil Kudashev
  Mar 28 at 9:33
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @HolyBlackCat Thanks a lot I will have a look at ray tracing
  
  – Xys
  Mar 28 at 13:20
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @mlkn Thanks this link is very interesting. In the shader you linked, the image "covers" all the sphere, do you know how I could place the image at a certain place on the sphere, not on the whole object ?
  
  – Xys
  Mar 28 at 13:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  when you know your sticker size and you want something simple you can experiment with texture projection on a sphere; created a little playground for experiment (hope it is useful) shadertoy.com/view/3dBSzy
  
  – nabr
  Apr 1 at 18:55
  

  
  
  
  

 | 
show 3 more comments

1

0

I'm trying to add a "sticker" on an equirectangular image.

The parameters I have are the angle of the sticker (yaw, pitch, roll), and its size in pixels, and the equirectangular image size (always a 2:1 ratio).

Example with this sticker (don't mind the background) :

If we put the sticker at the bottom of the sphere, the shader should be able to get something like this :

opengl geometry glsl 360-degrees 360-virtual-reality

share|improve this question

edited Apr 2 at 16:32

Xys

asked Mar 27 at 12:29

XysXys

35833 silver badges2020 bronze badges

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  I suggest using raytracing. If I understand the wikipedia page on equirectangular projection correctly, you can easily get ray directions from image coordinates (ray_yaw = x / image_w * 2 * pi and ray_pitch = (y + image_h/2) / image_h * pi or something similar). Then for each ray you just need to find a point where (and if) it intersects your quad (the math should be relatively easy to google).
  
  – HolyBlackCat
  Mar 27 at 13:47
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Shadertoy reference: shadertoy.com/view/MlfSz7
  
  – Ramil Kudashev
  Mar 28 at 9:33
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @HolyBlackCat Thanks a lot I will have a look at ray tracing
  
  – Xys
  Mar 28 at 13:20
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @mlkn Thanks this link is very interesting. In the shader you linked, the image "covers" all the sphere, do you know how I could place the image at a certain place on the sphere, not on the whole object ?
  
  – Xys
  Mar 28 at 13:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  when you know your sticker size and you want something simple you can experiment with texture projection on a sphere; created a little playground for experiment (hope it is useful) shadertoy.com/view/3dBSzy
  
  – nabr
  Apr 1 at 18:55
  

  
  
  
  

 | 
show 3 more comments

I'm trying to add a "sticker" on an equirectangular image.

The parameters I have are the angle of the sticker (yaw, pitch, roll), and its size in pixels, and the equirectangular image size (always a 2:1 ratio).

Example with this sticker (don't mind the background) :

If we put the sticker at the bottom of the sphere, the shader should be able to get something like this :

opengl geometry glsl 360-degrees 360-virtual-reality

share|improve this question

edited Apr 2 at 16:32

Xys

asked Mar 27 at 12:29

XysXys

35833 silver badges2020 bronze badges

share|improve this question

edited Apr 2 at 16:32

Xys

asked Mar 27 at 12:29

XysXys

35833 silver badges2020 bronze badges

share|improve this question

edited Apr 2 at 16:32

Xys

asked Mar 27 at 12:29

XysXys

35833 silver badges2020 bronze badges

asked Mar 27 at 12:29

XysXys

35833 silver badges2020 bronze badges

asked Mar 27 at 12:29

XysXys

35833 silver badges2020 bronze badges