PBRT創作並顯示一個康奈爾盒
阿新 • • 發佈：2021-01-18
技術標籤：PBRT
PBRT原始碼解讀見PBRT原始碼解讀
首先是完整的原始碼：
Integrator "path" "integer maxdepth" [ 5 ] LookAt 0 1 5 0 1 0 0 1 0 Sampler "sobol" "integer pixelsamples" [ 4 ] PixelFilter "triangle" "float xwidth" [ 1.000000 ] "float ywidth" [ 1.000000 ] Film "image" "integer xresolution" [ 512 ] "integer yresolution" [ 512 ] "string filename" [ "cornellBox.png" ] Camera "perspective" "float fov" [ 28.500000 ] WorldBegin MakeNamedMaterial "LeftWall" "string type" [ "matte" ] "rgb Kd" [ 0.630000 0.065000 0.050000 ] MakeNamedMaterial "RightWall" "string type" [ "matte" ] "rgb Kd" [ 0.140000 0.450000 0.091000 ] MakeNamedMaterial "Floor" "string type" [ "matte" ] "rgb Kd" [ 0.725000 0.710000 0.680000 ] MakeNamedMaterial "Ceiling" "string type" [ "matte" ] "rgb Kd" [ 0.725000 0.710000 0.680000 ] MakeNamedMaterial "BackWall" "string type" [ "matte" ] "rgb Kd" [ 0.725000 0.710000 0.680000 ] MakeNamedMaterial "ShortBox" "string type" [ "matte" ] "rgb Kd" [ 0.725000 0.710000 0.680000 ] MakeNamedMaterial "TallBox" "string type" [ "matte" ] "rgb Kd" [ 0.725000 0.710000 0.680000 ] MakeNamedMaterial "Light" "string type" [ "matte" ] "rgb Kd" [ 0.000000 0.000000 0.000000 ] NamedMaterial "Floor" Shape "trianglemesh" "integer indices" [ 0 1 2 0 2 3 ] "point P" [ -1 0 -1 -1 0 1 1 0 1 1 0 -1 ] "normal N" [ 0 1 0 0 1 0 0 1 0 0 1 0 ] "float uv" [ 0 0 1 0 1 1 0 1 ] NamedMaterial "Ceiling" Shape "trianglemesh" "integer indices" [ 0 1 2 0 2 3 ] "point P" [ 1 2 1 -1 2 1 -1 2 -1 1 2 -1 ] "normal N" [ 0 -1 0 0 -1 0 0 -1 0 0 -1 0 ] "float uv" [ 0 0 1 0 1 1 0 1 ] NamedMaterial "BackWall" Shape "trianglemesh" "integer indices" [ 0 1 2 0 2 3 ] "point P" [ -1 0 -1 -1 2 -1 1 2 -1 1 0 -1 ] "normal N" [ 0 0 -1 0 0 -1 0 0 -1 0 0 -1 ] "float uv" [ 0 0 1 0 1 1 0 1 ] NamedMaterial "RightWall" Shape "trianglemesh" "integer indices" [ 0 1 2 0 2 3 ] "point P" [ 1 0 -1 1 2 -1 1 2 1 1 0 1 ] "normal N" [ 1 0 0 1 0 0 1 0 0 1 0 0 ] "float uv" [ 0 0 1 0 1 1 0 1 ] NamedMaterial "LeftWall" Shape "trianglemesh" "integer indices" [ 0 1 2 0 2 3 ] "point P" [ -1 0 1 -1 2 1 -1 2 -1 -1 0 -1 ] "normal N" [ -1 0 0 -1 0 0 -1 0 0 -1 0 0 ] "float uv" [ 0 0 1 0 1 1 0 1 ] NamedMaterial "ShortBox" Shape "trianglemesh" "integer indices" [ 0 2 1 0 3 2 4 6 5 4 7 6 8 10 9 8 11 10 12 14 13 12 15 14 16 18 17 16 19 18 20 22 21 20 23 22 ] "point P" [ -0.0460751 0.6 0.573007 -0.0460751 -2.98023e-008 0.573007 0.124253 0 0.00310463 0.124253 0.6 0.00310463 0.533009 0 0.746079 0.533009 0.6 0.746079 0.703337 0.6 0.176177 0.703337 2.98023e-008 0.176177 0.533009 0.6 0.746079 -0.0460751 0.6 0.573007 0.124253 0.6 0.00310463 0.703337 0.6 0.176177 0.703337 2.98023e-008 0.176177 0.124253 0 0.00310463 -0.0460751 -2.98023e-008 0.573007 0.533009 0 0.746079 0.533009 0 0.746079 -0.0460751 -2.98023e-008 0.573007 -0.0460751 0.6 0.573007 0.533009 0.6 0.746079 0.703337 0.6 0.176177 0.124253 0.6 0.00310463 0.124253 0 0.00310463 0.703337 2.98023e-008 0.176177 ] "normal N" [ -0.958123 -4.18809e-008 -0.286357 -0.958123 -4.18809e-008 -0.286357 -0.958123 -4.18809e-008 -0.286357 -0.958123 -4.18809e-008 -0.286357 0.958123 4.18809e-008 0.286357 0.958123 4.18809e-008 0.286357 0.958123 4.18809e-008 0.286357 0.958123 4.18809e-008 0.286357 -4.37114e-008 1 -1.91069e-015 -4.37114e-008 1 -1.91069e-015 -4.37114e-008 1 -1.91069e-015 -4.37114e-008 1 -1.91069e-015 4.37114e-008 -1 1.91069e-015 4.37114e-008 -1 1.91069e-015 4.37114e-008 -1 1.91069e-015 4.37114e-008 -1 1.91069e-015 -0.286357 -1.25171e-008 0.958123 -0.286357 -1.25171e-008 0.958123 -0.286357 -1.25171e-008 0.958123 -0.286357 -1.25171e-008 0.958123 0.286357 1.25171e-008 -0.958123 0.286357 1.25171e-008 -0.958123 0.286357 1.25171e-008 -0.958123 0.286357 1.25171e-008 -0.958123 ] "float uv" [ 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 1 ] NamedMaterial "TallBox" Shape "trianglemesh" "integer indices" [ 0 2 1 0 3 2 4 6 5 4 7 6 8 10 9 8 11 10 12 14 13 12 15 14 16 18 17 16 19 18 20 22 21 20 23 22 ] "point P" [ -0.720444 1.2 -0.473882 -0.720444 0 -0.473882 -0.146892 0 -0.673479 -0.146892 1.2 -0.673479 -0.523986 0 0.0906493 -0.523986 1.2 0.0906492 0.0495656 1.2 -0.108948 0.0495656 0 -0.108948 -0.523986 1.2 0.0906492 -0.720444 1.2 -0.473882 -0.146892 1.2 -0.673479 0.0495656 1.2 -0.108948 0.0495656 0 -0.108948 -0.146892 0 -0.673479 -0.720444 0 -0.473882 -0.523986 0 0.0906493 -0.523986 0 0.0906493 -0.720444 0 -0.473882 -0.720444 1.2 -0.473882 -0.523986 1.2 0.0906492 0.0495656 1.2 -0.108948 -0.146892 1.2 -0.673479 -0.146892 0 -0.673479 0.0495656 0 -0.108948 ] "normal N" [ -0.328669 -4.1283e-008 -0.944445 -0.328669 -4.1283e-008 -0.944445 -0.328669 -4.1283e-008 -0.944445 -0.328669 -4.1283e-008 -0.944445 0.328669 4.1283e-008 0.944445 0.328669 4.1283e-008 0.944445 0.328669 4.1283e-008 0.944445 0.328669 4.1283e-008 0.944445 3.82137e-015 1 -4.37114e-008 3.82137e-015 1 -4.37114e-008 3.82137e-015 1 -4.37114e-008 3.82137e-015 1 -4.37114e-008 -3.82137e-015 -1 4.37114e-008 -3.82137e-015 -1 4.37114e-008 -3.82137e-015 -1 4.37114e-008 -3.82137e-015 -1 4.37114e-008 -0.944445 1.43666e-008 0.328669 -0.944445 1.43666e-008 0.328669 -0.944445 1.43666e-008 0.328669 -0.944445 1.43666e-008 0.328669 0.944445 -1.43666e-008 -0.328669 0.944445 -1.43666e-008 -0.328669 0.944445 -1.43666e-008 -0.328669 0.944445 -1.43666e-008 -0.328669 ] "float uv" [ 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 1 ] AttributeBegin AreaLightSource "diffuse" "rgb L" [ 17.000000 17.000000 17.000000 ] NamedMaterial "Light" Shape "trianglemesh" "integer indices" [ 0 1 2 0 2 3 ] "point P" [ -0.24 1.98 -0.22 0.23 1.98 -0.22 0.23 1.98 0.16 -0.24 1.98 0.16 ] "normal N" [ -8.74228e-008 -1 1.86006e-007 -8.74228e-008 -1 1.86006e-007 -8.74228e-008 -1 1.86006e-007 -8.74228e-008 -1 1.86006e-007 ] "float uv" [ 0 0 1 0 1 1 0 1 ] AttributeEnd WorldEnd
原始碼很簡單，我們的視點在（0 1 5）座標上，看向（0 1 0）位置，up向量是（0 1 0）。
採用透視相機，視野角為28.5。
對於場景的每個面片，採用點索引和點位置表示：
"integer indices" [ 0 1 2 0 2 3 ] "point P" [ -1 0 -1 -1 0 1 1 0 1 1 0 -1 ]點的位置都是計算好的，也不需要額外的面片模型檔案。
渲染結果：
設定的渲染"integer maxdepth"和"integer pixelsamples"高一些，可以得到：
