CODEWITHSUNDEEP
openglglslmultiplication
Xyten
Xyten

Reputation: 33

GLSL Vector multiplication returns error? Model is not rendered

I've been trying to study opengl for a fun side project and ran into some issue while learning.

Below is a fragment shader:

#version 330 core
in vec3 Normal;
in vec3 Position;
in vec2 TexCoords;
out vec4 color;

uniform vec3 cameraPos;
uniform samplerCube skybox;

struct Material{
    sampler2D diffuse0;
    sampler2D specular0;
    sampler2D emitter0;
    sampler2D reflection0;
    float shininess;
};
uniform Material material;


void main(){

    vec3 I = normalize(Position - cameraPos);
    vec3 R = reflect(I, normalize(Normal));

    float intensity = 0;
    intensity += texture(material.reflection0, TexCoords).x;

    vec4 rfl = texture(skybox, R);

    //this line doesnt produce anything
    color = rfl * intensity;

}

When i used the code above, my model is completely gone from view.

But, if i debug it out separately such as changing the line

    color = rfl * intensity;

to 

    color = rfl;

This actually renders and returns the following picture with colors

And changing that line to

   color = vec4(intensity);

It renders and returns the following picture with colors

I've tried changing 

   color = rfl * some constant
   //or
   color = vec4(0.5) * intensity

And both rendered my model normally. I'm stumped as to why it doesnt render when i tried multiplying both rfl and intensity together. I think it might be because there are values that the multiplication to fail, but i have no idea what they might be.

Upvotes: 1

Views: 464

Answers (1)

MrShoor
MrShoor

Reputation: 46

Then you change

color = rfl * intensity;

to

color = rfl;

GLSL compiler will drop

uniform Material material;

due optimization. Same happens with skybox when you change line to:

color = intensity;

Make sure that you binding of texture uniforms is correct.

Upvotes: 1

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