Threedee Tales From Urban Bohemia

Transcript

1. None

2. 3D is hard

3. We’re building a videogame

4. We’re building a videogame

5. None
6. None
7. None

8. (You are being a smartass)

9. None

10. WHAT?

11. WebGL is A JavaScript API to render graphics accessing directly

    the GPU

12. WebGL is not An API for 3D graphics

13. WebGL is not An OpenGL Wrapper

14. angle angle OpenGL ES 2.0 to DirectX 9 translation

15. angle angle OpenGL ES 2.0 to DirectX 9 translation

16. WHERE?

17. None

18. DIV

19. CANVAS DIV

20. WebGL context CANVAS “webgl” .getContext(“webgl”) WebGL context the

21. WebGL context WebGL context(s) a b a.getContext(“webg b.getContext(“webg

22. WHEN?

23. DRAW DRAW DRAW DRAW DRAW DRAW DRAW DRAW Not when

    you want to

24. When the browser tells you to.

25. When the browser tells you to. requestAnimationFrame

26. BRO WHAT ABOUT DOUBLE BUFFERING

27. None

28. Tearing

29. Buffer A Buffer B

30. Buffer A Buffer B

31. Buffer A Buffer B

32. JavaScript doesn’t execute while the DOM is being rendered!

33. JavaScript doesn’t execute while the DOM is being rendered!

34. HOW?

35. Introducing... Jimmy the Vertex

36. I’m not looking forward to this...

37. (x, y, z)

38. +x +y +z RIGHT HAND REPRESENT

39. None
40. None
41. None

42. Local Space

43. World Space

44. Camera Space

45. Camera Space

46. Screen Space

47. xx xy xz Yx Yy Yz Zx Zy Zz {

    } World Space Local Space Model Matrix

48. xx xy xz Yx Yy Yz Zx Zy Zz {

    } Camera Space World Space View Matrix

49. xx xy xz Yx Yy Yz Zx Zy Zz {

    } Screen Space Camera Space Projection Matrix

50. We could do the matrix operations in JavaScript

51. We could do the matrix operations in JavaScript BUT WE

    DON’T

52. SHADER is a program that runs on the GPU. SHADER

    a

53. (THAT WAS EASY)

54. N N It begins with an...

55. OT JAVASCRIPT N N It begins with an...

56. GLSL GLSL OpenGL Shader Language

57. precision highp float; varying vec2 t; varying vec2 pos; uniform

    float time; uniform vec2 mouse; uniform int mouseLeft; uniform sampler2D tex0; void main() { float v1 = (sin(t.s+time) + 1.0) / 2.0; float v2 = (cos(t.t+time) + 1.0) / 2.0; float d = distance(mouse, pos); vec2 tt = vec2(t.s+sin(time/10.0), t.t+cos(time/10.0)); vec4 c1 = texture2D(tex0, tt) * 1.1; float avg = (c1.r+c1.g+c1.b)/3.0; float r = c1.r+v1*pow(avg,4.0) - pow(d,pow(avg,2.0) +float(mouseLeft)*avg); float g = c1.g+v2*pow(avg,4.0) - pow(d,pow(avg,2.0) +float(mouseLeft)*avg); float b = c1.g - pow(d,pow(avg,2.0) +float(mouseLeft)*avg); gl_FragColor = vec4(r, g, b, 1.0); }

58. precision highp float; varying vec2 t; varying vec2 pos; uniform

    float time; uniform vec2 mouse; uniform int mouseLeft; uniform sampler2D tex0; void main() { float v1 = (sin(t.s+time) + 1.0) / 2.0; float v2 = (cos(t.t+time) + 1.0) / 2.0; float d = distance(mouse, pos); vec2 tt = vec2(t.s+sin(time/10.0), t.t+cos(time/10.0)); vec4 c1 = texture2D(tex0, tt) * 1.1; float avg = (c1.r+c1.g+c1.b)/3.0; float r = c1.r+v1*pow(avg,4.0) - pow(d,pow(avg,2.0) +float(mouseLeft)*avg); float g = c1.g+v2*pow(avg,4.0) - pow(d,pow(avg,2.0) +float(mouseLeft)*avg); float b = c1.g - pow(d,pow(avg,2.0) +float(mouseLeft)*avg); gl_FragColor = vec4(r, g, b, 1.0); } WELL THIS KINDA LOOKS LIKE JAVASCRIPT WELL THIS KINDA LOOKS LIKE JAVASCRIPT

59. precision highp float; varying vec2 t; varying vec2 pos; uniform

    float time; uniform vec2 mouse; uniform int mouseLeft; uniform sampler2D tex0; void main() { float v1 = (sin(t.s+time) + 1.0) / 2.0; float v2 = (cos(t.t+time) + 1.0) / 2.0; float d = distance(mouse, pos); vec2 tt = vec2(t.s+sin(time/10.0), t.t+cos(time/10.0)); vec4 c1 = texture2D(tex0, tt) * 1.1; float avg = (c1.r+c1.g+c1.b)/3.0; float r = c1.r+v1*pow(avg,4.0) - pow(d,pow(avg,2.0) +float(mouseLeft)*avg); float g = c1.g+v2*pow(avg,4.0) - pow(d,pow(avg,2.0) +float(mouseLeft)*avg); float b = c1.g - pow(d,pow(avg,2.0) +float(mouseLeft)*avg); gl_FragColor = vec4(r, g, b, 1.0); }

60. precision highp float; varying vec2 t; varying vec2 pos; uniform

    float time; uniform vec2 mouse; uniform int mouseLeft; uniform sampler2D tex0; void main() { float v1 = (sin(t.s+time) + 1.0) / 2.0; float v2 = (cos(t.t+time) + 1.0) / 2.0; float d = distance(mouse, pos); vec2 tt = vec2(t.s+sin(time/10.0), t.t+cos(time/10.0)); vec4 c1 = texture2D(tex0, tt) * 1.1; float avg = (c1.r+c1.g+c1.b)/3.0; float r = c1.r+v1*pow(avg,4.0) - pow(d,pow(avg,2.0) +float(mouseLeft)*avg); float g = c1.g+v2*pow(avg,4.0) - pow(d,pow(avg,2.0) +float(mouseLeft)*avg); float b = c1.g - pow(d,pow(avg,2.0) +float(mouseLeft)*avg); gl_FragColor = vec4(r, g, b, 1.0); } “

61. precision highp float; varying vec2 t; varying vec2 pos; uniform

    float time; uniform vec2 mouse; uniform int mouseLeft; uniform sampler2D tex0; void main() { float v1 = (sin(t.s+time) + 1.0) / 2.0; float v2 = (cos(t.t+time) + 1.0) / 2.0; float d = distance(mouse, pos); vec2 tt = vec2(t.s+sin(time/10.0), t.t+cos(time/10.0)); vec4 c1 = texture2D(tex0, tt) * 1.1; float avg = (c1.r+c1.g+c1.b)/3.0; float r = c1.r+v1*pow(avg,4.0) - pow(d,pow(avg,2.0) +float(mouseLeft)*avg); float g = c1.g+v2*pow(avg,4.0) - pow(d,pow(avg,2.0) +float(mouseLeft)*avg); float b = c1.g - pow(d,pow(avg,2.0) +float(mouseLeft)*avg); gl_FragColor = vec4(r, g, b, 1.0); } <script id="fragment-shader" type="x-shader/x-fragment"> </script>

62. document.getElementById document.getElementById

63. GLSL GLSL GLSL compile compile compile link

64. xx xy xz Yx Yy Yz Zx Zy Zz {

    } xx xy xz Yx Yy Yz Zx Zy Zz { } Perspective Matrix Model View Matrix

65. attribute vec3 aVertexPosition; uniform mat4 uMVMatrix; uniform mat4 uPMatrix; void

    main(void) { gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0); }

66. attribute vec3 aVertexPosition; uniform mat4 uMVMatrix; uniform mat4 uPMatrix; void

    main(void) { gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0); } Output

67. attribute vec3 aVertexPosition; uniform mat4 uMVMatrix; uniform mat4 uPMatrix; void

    main(void) { gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0); } Output Uniforms

68. attribute vec3 aVertexPosition; uniform mat4 uMVMatrix; uniform mat4 uPMatrix; void

    main(void) { gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0); } Output Uniforms Attribute
69. None
70. None

71. xx xy xz Yx Yy Yz Zx Zy Zz {

    } xx xy xz Yx Yy Yz Zx Zy Zz { } Passing Uniforms var ptr = gl.getUniformLocation(shaderProgram, "uPMatrix") gl.uniformMatrix4fv( ptr, false, new Float32Array(vertexes));
72. None

73. -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0,

    1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, Here come the vertices

74. -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0,

    1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, Here come the vertices

75. -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0,

    1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, Here come the vertices

76. -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0,

    1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, Here come the vertices

77. -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0,

    1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, Here come the vertices

78. cubeVertices = gl.createBuffer(); gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertices); gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW); gl.bindBuffer(gl.ARRAY_BUFFER,

    cubeVertices); gl.vertexAttribPointer(vertexPositionAttribute, 3, gl.FLOAT, false, 0, 0); 0,1,0 1,0,0 0,1,1 1,0,1 1,1,1 Passing Vertices

79. cubeVertices = gl.createBuffer(); gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertices); gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW); gl.bindBuffer(gl.ARRAY_BUFFER,

    cubeVertices); gl.vertexAttribPointer(vertexPositionAttribute, 3, gl.FLOAT, false, 0, 0); 0,1,0 1,0,0 0,1,1 1,0,1 1,1,1 Passing Vertices

80. xx xy xz Yx Yy Yz Zx Zy Zz {

    } xx xy xz Yx Yy Yz Zx Zy Zz { } Uniforms gl_Position 0,1,0 1,0,0 0,1,1 1,0,1 1,1,1 [aVertexPosition] drawArrays*

81. xx xy xz Yx Yy Yz Zx Zy Zz {

    } xx xy xz Yx Yy Yz Zx Zy Zz { } Uniforms gl_Position 0,1,0 1,0,0 0,1,1 1,0,1 1,1,1 [aVertexPosition] drawArrays*

82. xx xy xz Yx Yy Yz Zx Zy Zz {

    } xx xy xz Yx Yy Yz Zx Zy Zz { } Uniforms gl_Position 0,1,0 1,0,0 0,1,1 1,0,1 1,1,1 [aVertexPosition] drawArrays*

83. xx xy xz Yx Yy Yz Zx Zy Zz {

    } xx xy xz Yx Yy Yz Zx Zy Zz { } Uniforms gl_Position 0,1,0 1,0,0 0,1,1 1,0,1 1,1,1 [aVertexPosition] drawArrays*

84. xx xy xz Yx Yy Yz Zx Zy Zz {

    } xx xy xz Yx Yy Yz Zx Zy Zz { } Uniforms gl_Position 0,1,0 1,0,0 0,1,1 1,0,1 1,1,1 [aVertexPosition] drawArrays*

85. Rasterization

86. None
87. None

88. Fragments

89. Fragment Shader varying lowp vec4 vColor; void main(void) { gl_FragColor

    = vColor; }

90. Fragment Shader varying lowp vec4 vColor; void main(void) { gl_FragColor

    = vColor; } Output

91. Fragment Shader varying lowp vec4 vColor; void main(void) { gl_FragColor

    = vColor; } Output Variant

92. Variants Vertex Shader Fragment Shader

93. None
94. None

95. Color

96. Color Texture

97. Color Texture Lighting

98. Color Texture Lighting Specularity

99. Color Texture Lighting Specularity Normal Mapping

100. Color Texture Lighting Specularity Normal Mapping ...

101. Clear Canvas Load Perspective M atrixes Load O bject M

     atrixes Render O bject
102. None

103. Three.js https://github.com/mrdoob/three.js A.K.A. use

104. 3D is hard

105. 3D is hard hard to understand

106. 3D is hard hard to understand hard to learn

107. Hard to get right

108. But we need to try

109. None

110. twitter.com/vmg github.com/vmg

111. With demos from: http://wagerfield.github.io/flat-surface-shader/ http://lab.aerotwist.com/webgl/surface/ http://www.mrdoob.com/lab/javascript/beachballs/ http://plumegraph.org/