HDRI than ordinary RGB format with images (8bit only the brightness range) a greater range of brightness. Standard RGB image is the maximum brightness value is 255/255/255, if such images with radiosity lighting a scene, even if it is the brightest white is not enough to provide sufficient lighting to simulate the real world situation, rendering the result will look dull and lack contrast because this is the reality in the image file to a wide range of lighting information 8bit RGB images only a description. But the use of HDRI, then the brightness equivalent to the value of sunlight (such as 6000%) to the calculation of light transmission and reflection of the rendering, rendering the results obtained are very real and beautiful. The following two rendering using HDRI images can be seen that after the huge difference.
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What is HDR? What is the HDRI? What is the HDRI files? What is the HDR effects? How to achieve HDR effects? What is HDR? Talk about the game's HDR images often said in the end what is it? HDR, itself is a High-Dynamic Range (HDR) acronym, which was originally a CG concept. When the computer said the image is 8bit (256) level or 16bit (65536) to distinguish the image brightness level, but it can not reproduce a few hundred or tens of thousands of real natural lighting conditions. HDR file is a special kind of graphics file formats, in addition to each of its ordinary RGB pixel information, as well as the actual brightness of the point information. Common graphics file for each pixel is only 0 - 255 gray-scale range, which in fact is not enough. Imagine the sun and a luminous intensity of gray between black range of objects or differences in the brightness range, far more than 256 levels. Therefore, a common landscape pictures during the day, looking clouds and the sun may have shown the same intensity / brightness, are pure white, but in fact clouds and the sun can not be identical between the actual brightness between them brightness difference is huge. Therefore, the common graphics file formats is very accurate, far no record of the actual state of the real world. So now we have to introduce high dynamic range images (referred to as HDRI). What is the HDRI? HDRI is a High-Dynamic Range (HDR) image of the acronym is invented to solve this problem out, simply, HDRI is a very wide range of image brightness, than the other formats have a greater brightness of the image data storage , and it records the brightness of images in different ways with the traditional, not by way of non-linear brightness information compressed into 8bit or 16bit color space, but with the way records directly correspond to the brightness information, it can be said to record pictures environment, lighting information, so we can use this image to Many HDRI files are provided in the form panorama, we can use it to produce an environmental background reflection and refraction. HDRI and to emphasize here is essentially different panorama, panorama refers to the scene contains a 360-degree range of the ordinary image, which can be JPG format, BMP format, TGA format, etc., belong to Low-Dynamic Range Radiance Image, it not with the light information. What is the HDRI files? HDRI file is a file extension hdr or tif format, have the ability to save the light of information, but not necessarily the panorama. Dynamic Range (dynamic range) is a scene of the brightest and darkest parts of the relative ratio. An HDR image, it records well beyond the 256 level of the actual scene brightness value, the excess portion is not displayed on the screen out. Can be imagined: in photoshop to open a picture from the interior 外拍 out of the window, the window part in strong sunlight, overexposure, showing that a white, not much detail. You will have no way to dim it will only become gray and will not show more details. However, if the same scene is recorded by the hdr, you reduce the exposure, white part of the original will show more details. HDRI file specific use: HDRI environment map to use First, you need to have hdr software, the chip into a hdr image format, so as to be hdr reference. You can check the Internet to download software. HDRI reflection map texture can be simulated environment, but the texture will not be displayed in the background in the scene,
nike air force one, the picture is to use reflection or refraction. In the material panel, select a material ball, the left has a logo, that is, a small black arrow, pointing to a small green arrow, click, the pop-up to the Material / Map Browser, choose Select the HDR map in the environment map (prior to use software to do the hdr hdrshop files), so do the environment map textures. Press F10, enter the Render renderer instances of copying in order to manage,
nike air force one high, so do the environment map. Rendered image, you will find a hollow where the original scene should be black, is now a reflection of the shadow map attached. Of course, this reflects the environment map can be produced. You can also renderer in the V-Ray: Environment environment selected material, the material dragged into the material by way of example to operate the ball. In the Map type, you can select the background rendering the figure in what way is presented, Angular Angular mapping method, Cubic is the way of the cube environment, Spherical spherical environment, Mirrored spherical mirror, Explicit map external map channel. If you directly paste the jpg format in the environment, the effect seems not very OK! Note: renderer V-Ray: Environment 【V-Ray: Environment】 and 3dmax renderer to render the environment in V-Ray: Environment, if you open a can find a man named GI Environment (skylight) override 【global illumination environment (sky) covering】, this does not render the background and the reflection, rendering, but also will not appear in the background (Reflecdtion / refraction enviewnment override) will be reflected. In rendering - Environment (shortcut key 8) in the VRayHDRI map background color can also be put into this time, rendering the background will become the current color, object reflection will have, but if the renderer is set Reflecdtion / refraction enviewnment override, it will replace rendering - Environment (shortcut key 8) What is the HDR effects reflected set? HDR and the game will now be linked. HDR HDR effects in the game especially. HDR effects with Vertex Shader / ShaderModel / Soft shadows / Parallax Mapping, and so parallel image rendering effects. Want to achieve HDR effects, first of all, the game developers in game development process, the use of development tools (ie game engine) to the actual scene recorded with the HDR, of course,
nike air force one low, the strong development of technology development team will be directly with a small development tools (such as 3D MAX certain effects plug-ins) to create HDRI images; Second, we must support the graphics display HDR effects, nVIDIA GeForce 6 graphics cards must be series or higher, ATI Radeon 9550 graphics card at least or more. HDR effects was first implemented in the nVIDIA graphics card, but ATI's SMARTSHADER technology also includes HDR technology. How to achieve HDR effects? To achieve HDR effects are not complicated, but if you want to achieve normal, you must have a GeForce 6 Series nVIDIA graphics card or higher, at least ATI Radeon 9550 graphics card or above. Also to be strong enough CPU and memory, CPU Pentium 4 2.8G or above, at least. You must install DirectX 9.0c. Try to install the driver for your graphics card. Note: Based on current information,
nike air force 1 high, only the Such as the title stated, this article will be discussed in MAX using HDRI (High Dynamic Range Radiance Image). Then the HDRI is what is it? As mentioned above, we should have solved the HDRI in the concept. In general, when the computer said the image is 8bit (256) level or 16bit (65536) to distinguish between the image brightness level, but that a few hundred or tens of thousands can not reproduce the true nature of the illumination. HDRI is to put forward to solve this problem. Simply put HDRI is a very wide range of image brightness, and it records the brightness of images in different ways and traditions, not by way of non-linear brightness information compressed to 8bit or 16bit color space,
air force one high, but rather directly way of recording the corresponding brightness information, it can be said to record the image information on the lighting environment, so we can use this image to Of course slightly, there are many HDRI files are provided in the form panorama, we can use it to produce an environmental background reflection and refraction. HDRI and to emphasize here is essentially different panorama, panorama refers to the scene contains a 360-degree range of common image format can be JPG, BMP format, TGA formats, Low Dynamic Range Radiance Image, it does not carry lighting information; and HDRI hdr file or tif refers to the format, have the ability to save the light information,
nike air force 1, but not necessarily a panorama. (For a detailed explanation of HDRI see SIGGRAGH paper) More Atlas Atlas entry Open Category: CG
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