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How to render circle with constant size in perceptive projection?

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0

I want to render a circle with constant size in pixels, regardless of the item depth (in perspective projection).

When I use glPointSize there is a small difference in size that correlates to the depth (near objects are larger then far ones).

The function description states:

The specified point size is multiplied with a distance attenuation
factor and clamped to the specified point size range, and further
clamped to the implementation-dependent point size range to produce
the derived point size using.

Is there a way to completely rasterize a point?

opengl projection perspective glpointsize

share|improve this question

edited Mar 24 at 21:51

Ma'ayan Gadot

asked Mar 23 at 1:27

Ma'ayan GadotMa'ayan Gadot

11

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  1
  

  
  
  
  
  
  

  
  
  What OpenGL version are you using? In the latest versions glPointSize literally means the size in pixels. (I'm looking at OpenGL 4.5 spec and it doesn't have the phrasing you quoted.)
  
  – ybungalobill
  Mar 23 at 22:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have openGL version 4.0. The description is from gl2 documentation see link: khronos.org/registry/OpenGL-Refpages/gl2.1/xhtml/… But I get changes in pixels when using glPointSize
  
  – Ma'ayan Gadot
  Mar 24 at 21:48
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why are you using a perspective projection here? The whole point of a perspective projection is that things are smaller farther away. Your use case makes me think that an orthographic matrix might be needed.
  
  – mackycheese21
  Mar 26 at 18:51
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The perspective is intentional. I need to keep some objects (circles) in the scene with constant size,
  
  – Ma'ayan Gadot
  Mar 27 at 19:03
  

  
  
  
  

add a comment | 

0

I want to render a circle with constant size in pixels, regardless of the item depth (in perspective projection).

When I use glPointSize there is a small difference in size that correlates to the depth (near objects are larger then far ones).

The function description states:

The specified point size is multiplied with a distance attenuation
factor and clamped to the specified point size range, and further
clamped to the implementation-dependent point size range to produce
the derived point size using.

Is there a way to completely rasterize a point?

opengl projection perspective glpointsize

share|improve this question

edited Mar 24 at 21:51

Ma'ayan Gadot

asked Mar 23 at 1:27

Ma'ayan GadotMa'ayan Gadot

11

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  What OpenGL version are you using? In the latest versions glPointSize literally means the size in pixels. (I'm looking at OpenGL 4.5 spec and it doesn't have the phrasing you quoted.)
  
  – ybungalobill
  Mar 23 at 22:23
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have openGL version 4.0. The description is from gl2 documentation see link: khronos.org/registry/OpenGL-Refpages/gl2.1/xhtml/… But I get changes in pixels when using glPointSize
  
  – Ma'ayan Gadot
  Mar 24 at 21:48
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Why are you using a perspective projection here? The whole point of a perspective projection is that things are smaller farther away. Your use case makes me think that an orthographic matrix might be needed.
  
  – mackycheese21
  Mar 26 at 18:51
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The perspective is intentional. I need to keep some objects (circles) in the scene with constant size,
  
  – Ma'ayan Gadot
  Mar 27 at 19:03
  

  
  
  
  

add a comment | 

I want to render a circle with constant size in pixels, regardless of the item depth (in perspective projection).

When I use glPointSize there is a small difference in size that correlates to the depth (near objects are larger then far ones).

The function description states:

The specified point size is multiplied with a distance attenuation
factor and clamped to the specified point size range, and further
clamped to the implementation-dependent point size range to produce
the derived point size using.

Is there a way to completely rasterize a point?

opengl projection perspective glpointsize

share|improve this question

edited Mar 24 at 21:51

Ma'ayan Gadot

asked Mar 23 at 1:27

Ma'ayan GadotMa'ayan Gadot

11

share|improve this question

edited Mar 24 at 21:51

Ma'ayan Gadot

asked Mar 23 at 1:27

Ma'ayan GadotMa'ayan Gadot

11

share|improve this question

edited Mar 24 at 21:51

Ma'ayan Gadot

asked Mar 23 at 1:27

Ma'ayan GadotMa'ayan Gadot

11

asked Mar 23 at 1:27

Ma'ayan GadotMa'ayan Gadot

11

asked Mar 23 at 1:27

Ma'ayan GadotMa'ayan Gadot

11