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<!DOCTYPE html>

<html>

<head>

<title>hwshen WebGL — Rendering a teapot in Json format </title>

precision mediump float;

uniform mat4 uMMatrix;

uniform mat4 uVMatrix;

uniform mat4 uPMatrix;

uniform mat4 uNMatrix;

uniform vec4 light_pos;

uniform vec4 ambient_coef;

uniform vec4 diffuse_coef;

uniform vec4 specular_coef;

uniform float mat_shininess;

uniform vec4 light_ambient;

uniform vec4 light_diffuse;

uniform vec4 light_specular;

varying vec4 eye_pos;

varying vec3 v_normal;

varying vec4 vColor;

void main(void) {

gl_FragColor =vColor;

}

</script>

precision mediump float;

attribute vec3 aVertexPosition;

attribute vec3 aVertexNormal;

attribute vec3 aVertexColor;

uniform mat4 uMMatrix;

uniform mat4 uVMatrix;

uniform mat4 uPMatrix;

uniform mat4 uNMatrix;

uniform vec4 light_pos;

uniform vec4 ambient_coef;

uniform vec4 diffuse_coef;

uniform vec4 specular_coef;

uniform float mat_shininess;

uniform vec4 light_ambient;

uniform vec4 light_diffuse;

uniform vec4 light_specular;

varying vec4 eye_pos; //vertex position in eye space

varying vec3 v_normal; // vertex normal

varying vec4 vColor;

void main(void) {

// transform light pos from local to eye space

// vec4 light_pos_in_eye = uVMatrix * uMMatrix * light_pos;

vec4 light_pos_in_eye = light_pos;

// transform normal from local to eye space: normal matrix is the inverse transpose of the modelview matrix

v_normal =normalize(vec3(uNMatrix*vec4(aVertexNormal,0.0)));

// transform the vertex position to eye space

eye_pos = uVMatrix*uMMatrix*vec4(aVertexPosition, 1.0);

// light vector L = l-p

vec3 light_vector = normalize(vec3(light_pos_in_eye - eye_pos));

// eye vector V = e-p, where e is (0,0,0)

vec3 eye_vector = normalize(-vec3(eye_pos));

// halfway vector (L+V)

vec3 halfv = normalize(light_vector+eye_vector);

vec4 ambient = ambient_coef * light_ambient;

float ndotl = max(dot(v_normal, light_vector), 0.0);

vec4 diffuse = diffuse_coef * light_diffuse* ndotl;

// both lines below are okay. One is to use the reflect function the other is to compute by yourself

// vec3 R= normalize(vec3(reflect(-light_vector, v_normal)));

vec3 R = normalize(2.0 * ndotl *v_normal-eye_vector);

float rdotv = max(dot(R, eye_vector), 0.0);

vec4 specular;

if (ndotl>0.0)

specular = specular_coef* light_specular*pow(rdotv, mat_shininess);

else

specular = vec4(0,0,0,1);

gl_Position = uPMatrix*uVMatrix*uMMatrix*vec4(aVertexPosition, 1.0);

vColor = ambient+diffuse+specular;

// vColor = vec4(eye_vector, 1.0);

// vColor = vec4(aVertexColor,1.0);

// vColor = vec4(aVertexNormal, 1.0);

// vColor = vec4(v_normal, 1.0);

}

</script>

</head>

<h4> Geometry: </h4>

<button onclick="geometry(0)"> POINTS</button>

<button onclick="geometry(1)"> LINEs</button>

<button onclick="geometry(2)"> FACES</button>

<h4> Background: </h4>

<button onclick="BG(0,1,0)"> Green</button>

<button onclick="BG(0,0,0)"> Black</button>

<button onclick="BG(1,1,1)"> White</button>

<div>

<h4>

Click on the left mouse button and move the coursor to rotate

</h4>

</div>

<div>

<h3>

<div id="title"> teapot.html COMMENTS</div>

</h3>

<h5>

A simple 3D rendering of utah teapot in the json format

</h5>

</div>

</body>

</html>

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