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Specular highlight moves as camera moves

OpenGL object glossy/shiny in Mac OS X 10.6, but not 10.5. Why?Strange specular results from GLSL phong shaderSpecular lighting appears on both eye-facing and rear sides of objectSpecular highlights depend on camera distanceNot so smooth shadingOpenGL deferred rendering: point light implementationUniform value is wrong in adreno 305 qualcom device but right in Adreno ProfilerPhong implementation seems dark and also specular not working. Ray tracingWhy does my shader produce incorrect specular results? [DX11]Phong lighting: add specular lighting separately or with ambient and diffuse?

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I am implementing a specular highlight in OpenGL as part of the phong model. Currently, the highlight moves when my camera moves rather that getting brighter or dimmer which obviously isn't the expected result. I have followed the tutorial on learnopengl.com

#version 330 core

in vec3 outColor;
in vec3 outNormal;
in vec3 fragPos;

out vec4 FragColor;

uniform vec3 lightPos = vec3(-2.0f, 0.0f, 0.0f);
uniform vec3 lightColor = vec3(1.0, 0.5f, 1.0f);
uniform vec3 viewPos;


float ambientStrength = 0.2;
float specularStrength = 0.5;


uniform sampler2D tex;

void main()

 vec3 normal = normalize(outNormal);
 vec3 lightDir = normalize(lightPos - fragPos);

 //ambient lighitng
 vec3 ambient = ambientStrength * lightColor;

 //diffuse lighting
 float diffuseFactor = max(dot(normal, lightDir), 0.0);
 vec3 diffuse = diffuseFactor * lightColor;

 //specular lighting
 vec3 viewDir = normalize(viewPos - fragPos);
 vec3 reflectDir = reflect(-lightDir, normal);
 float spec = pow(max(dot(viewDir, reflectDir), 0.0), 128);
 vec3 specular = specularStrength * spec * lightColor;


 vec3 result = (ambient + diffuse + specular) * outColor;
 FragColor = vec4(result, 1.0f);// texture(tex, outTexCoords);// vec4(0.0f, 1.0f, 0.0f, 1.0f);

opengl glsl phong specular

share|improve this question

asked Mar 23 at 22:39

Callum PerksCallum Perks

84

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Um, why isn't it the expected result?
  
  – Nicol Bolas
  Mar 23 at 22:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Isn't it supposed to get brighter or dimmer, not move?
  
  – Callum Perks
  Mar 23 at 22:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @NicolBolas Isn't it supposed to get brighter or dimmer, not move?
  
  – Callum Perks
  Mar 23 at 22:43
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Well, if a center of the highlight moves, then there are positions on the surface where it gets brighter or darker. Just take any real object with a shiny surface and move around it. You will see that the highlights will move. This is what the Phong illumination model tries to mimic.
  
  – Nico Schertler
  Mar 23 at 23:44
  

  
  
  
  

add a comment | 

0

0

I am implementing a specular highlight in OpenGL as part of the phong model. Currently, the highlight moves when my camera moves rather that getting brighter or dimmer which obviously isn't the expected result. I have followed the tutorial on learnopengl.com

#version 330 core

in vec3 outColor;
in vec3 outNormal;
in vec3 fragPos;

out vec4 FragColor;

uniform vec3 lightPos = vec3(-2.0f, 0.0f, 0.0f);
uniform vec3 lightColor = vec3(1.0, 0.5f, 1.0f);
uniform vec3 viewPos;


float ambientStrength = 0.2;
float specularStrength = 0.5;


uniform sampler2D tex;

void main()

 vec3 normal = normalize(outNormal);
 vec3 lightDir = normalize(lightPos - fragPos);

 //ambient lighitng
 vec3 ambient = ambientStrength * lightColor;

 //diffuse lighting
 float diffuseFactor = max(dot(normal, lightDir), 0.0);
 vec3 diffuse = diffuseFactor * lightColor;

 //specular lighting
 vec3 viewDir = normalize(viewPos - fragPos);
 vec3 reflectDir = reflect(-lightDir, normal);
 float spec = pow(max(dot(viewDir, reflectDir), 0.0), 128);
 vec3 specular = specularStrength * spec * lightColor;


 vec3 result = (ambient + diffuse + specular) * outColor;
 FragColor = vec4(result, 1.0f);// texture(tex, outTexCoords);// vec4(0.0f, 1.0f, 0.0f, 1.0f);

opengl glsl phong specular

share|improve this question

asked Mar 23 at 22:39

Callum PerksCallum Perks

84

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Um, why isn't it the expected result?
  
  – Nicol Bolas
  Mar 23 at 22:40
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Isn't it supposed to get brighter or dimmer, not move?
  
  – Callum Perks
  Mar 23 at 22:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @NicolBolas Isn't it supposed to get brighter or dimmer, not move?
  
  – Callum Perks
  Mar 23 at 22:43
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  Well, if a center of the highlight moves, then there are positions on the surface where it gets brighter or darker. Just take any real object with a shiny surface and move around it. You will see that the highlights will move. This is what the Phong illumination model tries to mimic.
  
  – Nico Schertler
  Mar 23 at 23:44
  

  
  
  
  

add a comment | 

I am implementing a specular highlight in OpenGL as part of the phong model. Currently, the highlight moves when my camera moves rather that getting brighter or dimmer which obviously isn't the expected result. I have followed the tutorial on learnopengl.com

#version 330 core

in vec3 outColor;
in vec3 outNormal;
in vec3 fragPos;

out vec4 FragColor;

uniform vec3 lightPos = vec3(-2.0f, 0.0f, 0.0f);
uniform vec3 lightColor = vec3(1.0, 0.5f, 1.0f);
uniform vec3 viewPos;


float ambientStrength = 0.2;
float specularStrength = 0.5;


uniform sampler2D tex;

void main()

 vec3 normal = normalize(outNormal);
 vec3 lightDir = normalize(lightPos - fragPos);

 //ambient lighitng
 vec3 ambient = ambientStrength * lightColor;

 //diffuse lighting
 float diffuseFactor = max(dot(normal, lightDir), 0.0);
 vec3 diffuse = diffuseFactor * lightColor;

 //specular lighting
 vec3 viewDir = normalize(viewPos - fragPos);
 vec3 reflectDir = reflect(-lightDir, normal);
 float spec = pow(max(dot(viewDir, reflectDir), 0.0), 128);
 vec3 specular = specularStrength * spec * lightColor;


 vec3 result = (ambient + diffuse + specular) * outColor;
 FragColor = vec4(result, 1.0f);// texture(tex, outTexCoords);// vec4(0.0f, 1.0f, 0.0f, 1.0f);

opengl glsl phong specular

share|improve this question

asked Mar 23 at 22:39

Callum PerksCallum Perks

84

#version 330 core

in vec3 outColor;
in vec3 outNormal;
in vec3 fragPos;

out vec4 FragColor;

uniform vec3 lightPos = vec3(-2.0f, 0.0f, 0.0f);
uniform vec3 lightColor = vec3(1.0, 0.5f, 1.0f);
uniform vec3 viewPos;


float ambientStrength = 0.2;
float specularStrength = 0.5;


uniform sampler2D tex;

void main()

 vec3 normal = normalize(outNormal);
 vec3 lightDir = normalize(lightPos - fragPos);

 //ambient lighitng
 vec3 ambient = ambientStrength * lightColor;

 //diffuse lighting
 float diffuseFactor = max(dot(normal, lightDir), 0.0);
 vec3 diffuse = diffuseFactor * lightColor;

 //specular lighting
 vec3 viewDir = normalize(viewPos - fragPos);
 vec3 reflectDir = reflect(-lightDir, normal);
 float spec = pow(max(dot(viewDir, reflectDir), 0.0), 128);
 vec3 specular = specularStrength * spec * lightColor;


 vec3 result = (ambient + diffuse + specular) * outColor;
 FragColor = vec4(result, 1.0f);// texture(tex, outTexCoords);// vec4(0.0f, 1.0f, 0.0f, 1.0f);

share|improve this question

asked Mar 23 at 22:39

Callum PerksCallum Perks

84

share|improve this question

asked Mar 23 at 22:39

Callum PerksCallum Perks

84

asked Mar 23 at 22:39

Callum PerksCallum Perks

84

asked Mar 23 at 22:39

Callum PerksCallum Perks

84