I'm writing a simple 3D renderer and while the model loads fine, the colors are off. Quite a few fragments in the model show no color at all.
Here is the render:
The locations of the blacked out fragments change everytime I move my camera. From another angle:
Vertex shader:
#version 330 core
layout (location = 0) in vec3 pos;
layout (location = 1) in vec3 normal;
layout (location = 2) in vec2 uvCoords;
out vec2 texCoords;
out vec3 normCoords;
out vec3 fragmentPos;
uniform mat4 viewMatrix;
uniform mat4 projMatrix;
uniform mat4 modelMatrix; // Just an identity matrix for now
void main()
{
normCoords = normal;
fragmentPos = pos;
texCoords = uvCoords;
gl_Position = projMatrix * viewMatrix * modelMatrix * vec4(pos, 1.0);
}
Fragment shader:
#version 330 core
out vec4 frag_color;
in vec2 texCoords;
in vec3 normCoords;
in vec3 fragmentPos;
struct Light
{
vec3 lightPos;
vec3 lightColor;
};
uniform Light light;
uniform vec3 modelColor;
bool checkInf(in vec3 vect)
{
return (isinf(vect.x) || isinf(vect.y) || isinf(vect.z));
}
bool checkNan(in vec3 vect)
{
return (isnan(vect.x) || isnan(vect.y) || isnan(vect.z));
}
void main()
{
float ambientValue = 0.05;
vec3 ambientColor = ambientValue * light.lightColor;
vec3 result;
vec3 normalizedNormal = normalize(normCoords);
vec3 lightDir = normalize(light.lightPos - fragmentPos);
if(checkInf(normalizedNormal) || checkInf(lightDir) || checkNan(normalizedNormal) || checkNan(lightDir))
result = vec3(0.5,0.5,0.5);
else
{
float diffuseValue = max(dot(normalizedNormal, lightDir), 0.0);
vec3 diffuseColor = diffuseValue * light.lightColor;
result = (diffuseColor + ambientColor) * modelColor;
}
frag_color = vec4(result, 1.0);
}
After some playing around, I realized that the blacked out fragments were due to the diffuse lighting calculations. After some searching on the internet, I found this answer: answer that suggested it may be caused by normalized vector being Nan or infinity. To test that, I decided to check each normalized vector to see if it was Nan or infinity and if it was, set it to a grey color. But that didn't work.
Any help would be appreciated.
