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POnormalising vertex and normal coordinates Open GL ES 2.0
 

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  1. POnormalising vertex and normal coordinates Open GL ES 2.0
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    <p>I have a model created in blender and exported to an .obj file. I have written a parser that reads in the co ordinates for of the vertices textures and normals. I have been dividing all the co-ordinats by a constant applicable to the program to reduce the size of the mode so that it fits the screen(this is a temporary measure). This works fine except for the lighting which doesn't work, Im left with a black 3D object when it should be coloured. After researching it on the web, I think this could be because the normals aren't of length one? If this is true how can I scale my co-ordinates so that they fit the screen and get the lighting to work?</p> <p>Vertex Shader</p> <pre><code>// // Created by Jake Cunningham on 13/10/2012. // Copyright (c) 2012 Jake Cunningham. All rights reserved. // attribute vec4 position; attribute vec3 normal; varying lowp vec4 colorVarying; uniform mat4 modelViewProjectionMatrix; uniform mat3 normalMatrix; attribute vec2 TextCo; varying vec2 textCoOut; void main() { vec3 eyeNormal = normalize(normalMatrix * normal); vec3 lightPosition = vec3(0.0, 0.0, 1.0); vec4 diffuseColor = vec4(0.4, 0.4, 1.0, 1.0); float nDotVP = max(0.0, dot(eyeNormal, normalize(lightPosition))); colorVarying = diffuseColor * nDotVP; gl_Position = modelViewProjectionMatrix * position; textCoOut = TextCo; } </code></pre> <p>Fragment Shader:</p> <pre><code>// Created by Jake Cunningham on 13/10/2012. // Copyright (c) 2012 Jake Cunningham. All rights reserved. // varying lowp vec4 colorVarying; varying lowp vec2 textCoOut; uniform sampler2D texture; void main() { gl_FragColor = colorVarying * texture2D(texture, textCoOut); } </code></pre> <p>code from view controller.</p> <pre><code>glEnable(GL_DEPTH_TEST); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glGenVertexArraysOES(1, &amp;_vertexArray); glBindVertexArrayOES(_vertexArray); glGenBuffers(1, &amp;_vertexBuffer); glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer); glBufferData(GL_ARRAY_BUFFER, loader.currentCountOfVerticies * sizeof(GLfloat) * 3, arrayOfVerticies, GL_STATIC_DRAW); glEnableVertexAttribArray(GLKVertexAttribPosition); glVertexAttribPointer(GLKVertexAttribPosition, 3, GL_FLOAT, GL_FALSE, 12, BUFFER_OFFSET(0)); glGenVertexArraysOES(1, &amp;_normalArray); glBindVertexArrayOES(_normalArray); glGenBuffers(1, &amp;_normalBuffer); glBindBuffer(GL_ARRAY_BUFFER, _normalBuffer); glBufferData(GLKVertexAttribNormal, loader.currentCountOfNormals * sizeof(GLfloat) * 3,loader.arrayOfNormals , GL_STATIC_DRAW); glEnableVertexAttribArray(GLKVertexAttribNormal); glVertexAttribPointer(GLKVertexAttribNormal, 3, GL_FLOAT, GL_FALSE, 12, BUFFER_OFFSET(0)); glGenVertexArraysOES(1, &amp;_textureArray); glBindVertexArrayOES(_textureArray); glGenBuffers(1, &amp;_textureBuffer); glBindBuffer(GL_ARRAY_BUFFER, _textureBuffer); glBufferData(GL_ARRAY_BUFFER, loader.currentCountOfTextureCoordinates * sizeof(GLfloat) * 2, loader.arrayOftextureCoOrdinates, GL_STATIC_DRAW); glEnableVertexAttribArray(GLKVertexAttribTexCoord0); glVertexAttribPointer(GLKVertexAttribTexCoord0, 2, GL_FLOAT, GL_FALSE, 8, BUFFER_OFFSET(0)); glBindVertexArrayOES(0); </code></pre>
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      1. POnormalising vertex and normal coordinates Open GL ES 2.0
      1. USTheAmateurProgrammer
 

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