learn-wgpu/assets/js/27.3b14c055.js

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Here's the image before using HDR:")]),t._v(" "),s("p",[s("img",{attrs:{src:a(374),alt:"before hdr"}})]),t._v(" "),s("p",[t._v("Here's what it looks like after implementing HDR:")]),t._v(" "),s("p",[s("img",{attrs:{src:a(375),alt:"after hdr"}})]),t._v(" "),s("h2",{attrs:{id:"loading-hdr-textures"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#loading-hdr-textures"}},[t._v("#")]),t._v(" Loading HDR textures")]),t._v(" "),s("p",[t._v("Now that we have an HDR render buffer, we can start leveraging\nHDR textures to their fullest. One of the main uses for HDR\ntextures is to store lighting information in the form of an\nenvironment map.")]),t._v(" "),s("p",[t._v("This map can be used to light objects, display reflections and\nalso to make a skybox. We're going to create a skybox using HDR\ntexture, but first we need to talk about how environment maps are\nstored.")]),t._v(" "),s("h2",{attrs:{id:"equirectangular-textures"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#equirectangular-textures"}},[t._v("#")]),t._v(" Equirectangular textures")]),t._v(" "),s("p",[t._v("An equirectangluar texture is a texture where a sphere is stretched\nacross a rectangular surface using what's known as an equirectangular\nprojection. This map of the Earth is an example of this projection.")]),t._v(" "),s("p",[s("img",{attrs:{src:"https://upload.wikimedia.org/wikipedia/commons/thumb/8/83/Equirectangular_projection_SW.jpg/1024px-Equirectangular_projection_SW.jpg",alt:"map of the earth"}})]),t._v(" "),s("p",[t._v("This projection maps the latitude values of the sphere to the\nhorizontal coordinates of the texture. The longitude values get\nmapped to the vertical coordinates. This means that the vertical\nmiddle of the texture is the equator (0° longitude) of the sphere,\nthe horizontal middle is the prime meridian (0° latitude) of the\nsphere, the left and right edges of the texture are the anti-meridian\n(+180°/-180° latitude) the top and bottom edges of the texture are\nthe north pole (90° longitude) and south pole (-90° longitude)\nrespectively.")]),t._v(" "),s("p",[s("img",{attrs:{src:a(376),alt:"equirectangular diagram"}})]),t._v(" "),s("p",[t._v("This simple projection is easy to use, leading it to be one of the\nmost popular projections for storing spherical textures. You can\nsee the particular environment map we are going to use below.")]),t._v(" "),s("p",[s("img",{attrs:{src:a(377),alt:"equirectangular skybox"}})]),t._v(" "),s("h2",{attrs:{id:"cube-maps"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#cube-maps"}},[t._v("#")]),t._v(" Cube Maps")]),t._v(" "),s("p",[t._v("While we technically can use an equirectangular map directly as long\nas we do some math to figure out the correct coordinates, it is a lot\nmore convenient to convert our environment map into a cube map.")]),t._v(" "),s("div",{staticClass:"info"},[s("p",[t._v("A cube map is special kind of texture that has 6 layers. Each layer\ncorresponds to a different face of an imaginary cube that is aligned\nto the X, Y and Z axes. 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