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# GLSL BumpMap Math error

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3 replies to this topic

### #1I CAN DO  Members

Posted 02 December 2013 - 10:17 AM

I have a problem with OpenGL and GLSL to implement Bump Map.

#version 330 core

layout (std140) uniform Matrices {

mat4 projViewModelMatrix;

mat3 normalMatrix;

mat4 modelViewMatrix;

};

uniform mat4 View;

uniform vec3 LightPosition;

uniform vec3 CameraPosition;

in vec3 position;

in vec3 normal;

in vec2 texCoord;

out vec2 TexCoord;

out vec3 Normal;

// BUMP MAPPING

/////////////////////////////////////

out vec3 lightVec;

out vec3 eyeVec;

in vec3 vTangent;

in vec3 bTangent;

void main()

{

Normal = normalize(normalMatrix * normal);

gl_Position = projViewModelMatrix * vec4(position, 1.0);

TexCoord = vec2(texCoord);

// BUMP MAPPING

vec3 n = normalize(normalMatrix * normal);

vec3 t = normalize(normalMatrix * vTangent);

vec3 b = normalize(normalMatrix * bTangent);

vec3 vVertex = vec3(modelViewMatrix * vec4(position, 1.0));

// vec3 tmpVec = LightPosition.xyz - vVertex.xyz;

vec3 tmpVec = (View * vec4(LightPosition, 1.0)).xyz - vVertex.xyz;

lightVec.x = dot(tmpVec, t);

lightVec.y = dot(tmpVec, b);

lightVec.z = dot(tmpVec, n);

tmpVec = -vVertex;

eyeVec.x = dot(tmpVec, t);

eyeVec.y = dot(tmpVec, b);

eyeVec.z = dot(tmpVec, n);

}

#version 330
layout (std140) uniform Material {

vec4 diffuse;

vec4 ambient;

vec4 specular;

vec4 emissive;

float shininess;

int texCount;

};

uniform sampler2D texUnit;

in vec3 Normal;

in vec2 TexCoord;

out vec4 outputF;

//BUMP MAPPING ///////////////////////////////////////////

in vec3 lightVec;

in vec3 eyeVec;

uniform sampler2D normalMap;

uniform vec4 diffuseLight;

uniform vec4 ambientLight;

uniform vec4 specularLight;

main()

{

vec3 N2 = normalize(texture(normalMap, TexCoord).xyz * 2.0 - 1.0);

vec3 L2 = normalize(lightVec);

vec3 V2 = normalize(eyeVec);

vec3 R2 = normalize(-reflect(L2, N2));

float NdotL = max(0.0, dot(N2, L2));

float RdotV = max(0.0, dot(R2, V2));

// Compute final colours.

vec4 ambient = ambientLight * ambient;

vec4 diffuse = diffuseLight * diffuse * NdotL;

vec4 specular2 = specularLight * specular * (pow(RdotV, shininess) * 1);

vec4 base = texture2D(texUnit, TexCoord);

// Final colour.

outputF = base * ambient + base * diffuse + specular2;

}

There is some error there? I feel that the calculation of the direction of the light is wrong. Could it be?

The line:

vec3 tmpVec = (View * vec4(LightPosition, 1.0)).xyz - vVertex.xyz;

is OK?

the line:

tmpVec = -vVertex;

OK? or I need change to:

tmpVec = (View * vec4(CameraPosition, 1.0)).xyz - vVertex.xyz;

or

tmpVec = (CameraPosition).xyz - vVertex.xyz;

Thank you, best regards.

#### Attached Thumbnails

Edited by swiftcoder, 02 December 2013 - 08:41 PM.
Please use [code] [/code] tags in future.

### #2I CAN DO  Members

Posted 02 December 2013 - 03:16 PM

Come on guys.

### #3assainator  Members

Posted 03 December 2013 - 04:10 AM

Come on guys.

Be a bit more patient, most people have jobs, education, family and lives to attend to beside roaming forums.

Edited by assainator, 03 December 2013 - 04:10 AM.

"What? It disintegrated. By definition, it cannot be fixed." - Gru - Dispicable me

"Dude, the world is only limited by your imagination" - Me

### #4N.I.B.  Members

Posted 03 December 2013 - 04:12 AM