添加assignment4

Assignment4/LICENSE

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+Copyright (c) 2021 Lingqi Yan <[email protected]>, All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Assignment4/README.md

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+# GAMES202 homework0
+
+## Usage
+
+### For Visual Studio Code
+Install plugin `Live Sever` and run with `index.html` directly
+
+### For Node.js users
+To install:
+```
+npm install http-server -g
+```
+To run(from `index.html` directory):
+```
+http-server . -p 8000
+```
+
+## In-web operation
+- Hold right mouse to rotate the camera
+- Scroll mouse wheel to zoom in/out
+- Hold left mouse to move the camera
+- Hold left mouse only to drag the GUI

Assignment4/TODO.md

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+You're correct. [From the spec](https://www.khronos.org/registry/gles/specs/2.0/es_full_spec_2.0.25.pdf) section 2.10.4
+
+>  When an attribute variable is declared as a `mat2`, its matrix columns are taken from the `(x, y)` components of generic attributes `i` and `i + 1`. When an attribute variable is declared as a `mat3`, its matrix columns are taken from the `(x, y, z)` components of generic attributes `i` through `i + 2`. When an attribute variable is declared as a `mat4`, its matrix columns are taken from the `(x, y, z, w)` components of generic attributes `i` through `i + 3`.
+
+stride and offsets in WebGL are in bytes so I suspect you wanted
+
+    gl.vertexAttribPointer(loc  , 4, gl.FLOAT, false, 64, 0);
+    gl.vertexAttribPointer(loc+1, 4, gl.FLOAT, false, 64, 16);
+    gl.vertexAttribPointer(loc+2, 4, gl.FLOAT, false, 64, 32);
+    gl.vertexAttribPointer(loc+3, 4, gl.FLOAT, false, 64, 48);
+
+Let's check
+
+<!-- begin snippet: js hide: false console: true babel: false -->
+
+<!-- language: lang-js -->
+
+    var vs = `
+    attribute mat4 matrix;
+    attribute vec4 color;
+
+    varying vec4 v_color;
+
+    void main() {
+      gl_PointSize = 10.0;
+      gl_Position = matrix * vec4(0, 0, 0, 1);
+      v_color = color;
+    }
+    `;
+    var fs = `
+    precision mediump float;
+
+    varying vec4 v_color;
+
+    void main() {
+      gl_FragColor = v_color;
+    }
+    `;
+
+    var m4 = twgl.m4;
+    var gl = document.querySelector("canvas").getContext("webgl");
+    var program = twgl.createProgramFromSources(gl, [vs, fs]);
+
+    var matrixLoc = gl.getAttribLocation(program, "matrix");
+    var colorLoc = gl.getAttribLocation(program, "color");
+
+    function r(min, max) {
+      if (max === undefined) {
+        max = min;
+        min = 0;
+      }
+      return Math.random() * (max - min) + min;
+    }
+
+    var numPoints = 100;
+    var matrices = [];
+    var colors = [];
+    for (var ii = 0; ii < numPoints; ++ii) {
+      matrices.push.apply(matrices, m4.translation([r(-1,1), r(-1,1), 0]));
+      colors.push(r(1), r(1), r(1), 1);
+    }
+
+    function makeBuffer(gl, array) {
+      const buf = gl.createBuffer();
+      gl.bindBuffer(gl.ARRAY_BUFFER, buf);
+      gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(array), gl.STATIC_DRAW);
+      return buf;
+    }
+
+    var buffers = {
+      matrices: makeBuffer(gl, matrices),
+      colors: makeBuffer(gl, colors),
+    };
+
+    gl.useProgram(program);
+
+    gl.bindBuffer(gl.ARRAY_BUFFER, buffers.matrices);
+    for (var ii = 0; ii < 4; ++ii) {
+      gl.enableVertexAttribArray(matrixLoc + ii);
+      gl.vertexAttribPointer(matrixLoc + ii, 4, gl.FLOAT, 0, 64, ii * 16);
+    }
+
+    gl.bindBuffer(gl.ARRAY_BUFFER, buffers.colors);
+    gl.enableVertexAttribArray(colorLoc);
+    gl.vertexAttribPointer(colorLoc, 4, gl.FLOAT, 0, 0, 0);
+
+    gl.drawArrays(gl.POINTS, 0, numPoints);
+
+<!-- language: lang-css -->
+
+    canvas { border: 1px solid black; }
+
+<!-- language: lang-html -->
+
+    <script src="https://twgljs.org/dist/4.x/twgl-full.js" crossorigin></script>
+    <canvas></canvas>
+
+<!-- end snippet -->
+

Assignment4/assets/ball/TestObj.mtl

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+# Blender MTL File: 'TestObj.blend'
+# Material Count: 2
+
+newmtl InnerMat
+Ns 225.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.796 0.62 0.482
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2
+
+newmtl OuterMat
+Ns 225.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.796 0.62 0.482
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.000000
+d 1.000000
+illum 2