One of the biggest contributors to any digital projects memory footprint comes from the size and amount of Textures used. Luckily Unreal Engine 4 has a very robust system for non-destructively reducing Texture size across all your projects Textures. In the following page we will take a look at these systems and how you can use them to reduce your projects Texture memory requirements.
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Unreal Engine 4 supports texture resolutions from 1x1 up to 8192x8192 with some slight modifications to .INI files. Current DirectX video adapters and game consoles support various texture resolutions from 1x1 to 2048x2048 and up to 8192x8192. The highest texture resolution supported by a specific hardware device varies by manufacturer, model and available texture memory. There are a number of features and settings in Unreal Engine 4 for managing the texture resolutions that are rendered for various areas such as world geometry or the user interface.
Engine Texture Resolution Limit
Unreal Engine 4 defaults to limiting the maximum number of texture mips to 14, which effectively limits the largest rendered texture to 8192 (1x1 to 8192x8192 is 14 mips). This has the side-effect that imported 8192 textures will only render up to mip1 of 4096. The constant MAX_TEXTURE_MIP_COUNT which defaults to 13 in the engine source files can be modified to a value of 14 to support 8192 texture rendering. This constant is defined in the following source files (as of QAMar09, be sure to verify on other QA versions).
With the release of UE 4.8 you can now modify your projects to use Textures up to 8192 in size without having to modify the C++ code by adding the following text to your projects BaseDeviceProfiles.ini file and setting the MaxLODsize to 8192
Once you have added the section you want to increase the size for, save the file and restart the Editor. When the Editor restarts any Textures that were imported at a size of 8192 should now show 8192 as the size of LOD 1, instead of being clamped to a maximum of 4096. In the following example image we have modified the BaseDeviceProfiles.ini file in a project to allow for the use of Textures that are up to 8192 in size. When the texture, Texture_8k_Test is loaded we can see that both the imported and displayed texture size are at 8192.
Click image for full size.
Compressed Texture Memory Requirements
DXT uses lossy compression based on packing pixels into 4x4 blocks with paletted colors and interpolated colors. This results in an 8:1 DXT1 and 4:1 DXT5 constant compression file size. Since video memory and texture pool resources are fixed for a specific platform and hardware, a balance must be struck between texture resolution and resource usage. The following table lists the texture memory requirements for DXT1 and DXT5 textures at various common resolutions with full mips (1x1 up to full native mip0). Note that the memory requirements are near-constant multiples of the texture resolution ratio, and that DXT5 textures require near-twice the memory of their DXT1 counterpart.
Since the resolution to compression ratio is a constant, to calculate the memory requirements for a texture resolution not listed here, simply multiply the resolution ratios. For example, a 1024x512 texture would be one-half the memory requirements of a 1024x1024 texture.
The table data was compiled from textures created by ATI's Compressonator using Box-Filter mip generation and DirectX Texture Compression.
Resolution
Total Mips from 1x1
DXT1
DXT5
Note that there are independent sets of TextureGroup entries for the Unreal Editor and in-game. These two sets are respectively located in the [SystemSettingsEditor] and [SystemSettings] sections in the config files.
The TextureLODGroup settings entries in the DefaultDeviceProfiles.ini file will look similar to this. Note that older QA versions may not include the MinMagFilter and MipFilter properties for each setting.
PC AppCompat Buckets
AppCompat is used to override various SystemSettings based on objective and empirical evidence gathered at startup. When app compatibility is enabled (PC only), the system measures machine capability, and then overwrites the Engine.ini values with preset values from one of 5 'buckets'. See BaseCompat.ini in the EngineConfig folder for an example of this usage.
AppCompat is intended to only be checked ONCE when the game is first run (not the editor). It detects this by checking for the existence of an [AppCompat] section in [game]Engine.ini, which contains the previously computed scores for the machine. If AppCompat has already been applied once, it is not changed again to allow custom changes to be made by users without being overwritten every time.
AppCompat is specifically disabled for the editor so machine specs do not affect how assets are viewed on various machines during development. This is the reason for the split between SystemSettings and SystemSettingsEditor.
You can effectively disable AppCompat by supplying an empty DefaultCompat.ini for your game, which causes it to initialize all buckets from [SystemSettings] in Engine.ini. In this case, the system operates exactly as it did before AppCompat was introduced.
TEXTUREGROUP Properties
Each TextureGroup entry defines the texture properties for a specific texture set as used in the game rendering. Grouping textures into common sets allows for better control over the texture memory pool use by various game texture resources.
A TextureGroup LODBias of 0 and a Texture Properties LODBias of 1 would result in a final LODBias of 1.
Left for dead for ppsspp pc. A TextureGroup LODBias of 1 and a Texture Properties LODBias of 1 would result in a final LODBias of 2.
A TextureGroup LODBias of 1 and a Texture Properties LODBias of -1 would result in a final LODBias of 0.
After the final LODBias is calculated, then the texture mip is checked to see that it fits into the TextureGroup's Min/Max LODSize range, and it is adjusted if necessary. This allows a simple config ini file change to effectively clamp a specific TextureGroup to within a set min/max LOD range.
For example, a 1024x1024 texture with LODBias of 1 uses the 512x512 mip, if it is in the TEXTUREGROUP_World LODGroup as shown above, it is then checked to see if it fits within the TextureGroup's Minimum and Maximum LODSize range, which in this case is 256 and 1024. Since each game title will have its own unique TextureGroup settings, artists and level designers should be aware of the MinLODSize and MaxLODSize for each group. It would increase distributable package size with no rendering quality benefit if a game shipped with 2048 textures assigned to a TextureGroup with a MaxLODSize of 1024.
Ppsspp Best Texture Settings For Texture Exporting Free
Texture Properties
Ppsspp Best Texture Settings For Texture Exporting List
For an explanation of the meaning of the various texture properties, see the Texture Properties page.