Textures
Textures are image or movie files that lay over or wrap around your GameObjects to give them a visual effect. This page details the properties you need to manage for your Textures.
Unity recognises any image or movie file in a 3D project’s Assets folder as a Texture (in 2D projects, they are saved as Sprites). As long as the image meets the size requirements specified below, it is imported and optimized for game use (although any Shaders you use for your GameObjects have specific Texture requirements). This extends to multi-layer Photoshop or TIFF files, which are automatically flattened on import so that there is no size penalty for your game. This flattening happens internally to Unity, not to the PSD file itself, and is optional, so you can continue to save and import your PSD files with layers intact.
Свойства
The Inspector window is split into two sections: the Texture Importer above, and the Preview below.
Texture Importer
The Texture Importer defines how images are imported from your project’s Assets folder into the Unity Editor. To access the Texture Importer, select the image file in the Project window. The Texture Importer opens in the Inspector window.
Note that some of the less commonly used properties are hidden by default. Click Advanced in the Inspector window to view these.
Texture Type
The first property in the Texture Importer is the Texture Type. Use this to select the type of Texture you want to create from the source image file. See documentation on Texture types for more information on each type.
| Property: | Function: |
|---|---|
| Texture Type | Use this to define what your Texture is to be used for. The other properties in the Texture Importer change depending on which one you choose. |
| Default | This is the most common setting used for all Textures. It provides access to most of the properties for Texture importing. |
| Normal Map | Select this to turn the color channels into a format suitable for real-time normal mapping. See Importing Textures for more information on normal mapping. |
| Editor GUI | Select this if you are using the Texture on any HUD or GUI controls. |
| Sprite (2D and UI) | Select this if you are using the Texture in a 2D game as a Sprite. |
| Cursor | Select this if you are using the Texture as a custom cursor. |
| Cookie | Select this to set your Texture up with the basic parameters used for the Cookies of your Scene’s Lights. |
| Lightmap | Select this if you are using the Texture as a Lightmap. This option enables encoding into a specific format (RGBM or dLDR, depending on the platform) and a post-processing step on Texture data (a push-pull dilation pass). |
| Single Channel | Select this if you only need one channel in the Texture. |
Texture Shape
The second property in the Texture Importer is the Texture Shape. Use this to select and define the shape and structure of the Texture.
| Property: | Function: |
|---|---|
| Texture Shape | Use this to define the shape of the Texture. This is set to 2D by default. |
| 2D | This is the most common setting for all Textures; it defines the image file as a 2D Texture. These are used to map textures to 3D meshes and GUI elements, among other project elements. |
| Cube | This defines the Texture as a cubemap. You could use this for Skyboxes or Reflection Probes, for example. Selecting Cube displays different mapping options. |
| Mapping | This setting is only available when Texture Shape is set to Cube. Use Mapping to specify how the Texture is projected onto your GameObject. This is set to Auto by default. |
| Auto | Unity tries to automatically work out the layout from the Texture information. |
| 6 Frames Layout (Cubic Environment) | The Texture contains six images arranged in one of the standard cubemap layouts: cross, or sequence (+x -x +y -y +z -z). The images can be orientated either horizontally or vertically. |
| Latitude Longitude (Cylindrical) | Maps the Texture to a 2D Latitude-Longitude representation. |
| Mirrored Ball (Sphere Mapped) | Maps the Texture to a sphere-like cubemap. |
| Convolution Type | Choose the type of pre-convolution (that is, filtering) that you want to use for this texture. The result of pre-convolution is stored in mips. This is set to None by default. |
| None | The Texture has no pre-convolution (no filtering). |
| Specular (Glossy Reflection) | Select this to use cubemaps as Reflection Probes. The Texture mip maps are pre-convoluted (filtered) with the engine BRDF. (See Wikipedia’s page on Bidirectional reflectance distribution function for more information.) |
| Diffuse (Irradiance) | The Texture is convoluted (filtered) to represent irradiance. This is useful if you use the cubemap as a Light Probe. |
| Fixup Edge Seams | This option is only available with the None or Diffuse convolution (filter). Use this on low-end platforms as a work-around for filtering limitations, such as cubemaps incorrectly filtered between faces. |
Advanced settings
The Advanced settings allow you to make finer adjustments to the way Unity handles your Texture. The order and availability of these settings might vary slightly depending on the Texture Type you choose.
| Property: | Description: |
|---|---|
| Non Power of 2 | If the Texture has a non-power of two (NPOT) dimension size, this defines a scaling behavior at import time. See documentation on Importing Textures for more information on non-power of two sizes. This is set to None by default. |
| None | Texture dimension size stays the same. |
| To nearest | The Texture is scaled to the nearest power-of-two dimension size at import time. For example, a 257x511 px Texture is scaled to 256x512 px. Note that PVRTC formats require Textures to be square (that is width equal to height), so the final dimension size is upscaled to 512x512 px. |
| To larger | The Texture is scaled to the power-of-two dimension size of the largest dimension size value at import time. For example, a 257x511 px Texture is scaled to 512x512 px. |
| To smaller | The Texture is scaled to the power-of-two dimension size of the smallest dimension size value at import time. For example, a 257x511 px Texture is scaled to 256x256 px. |
| Read/Write Enabled | Enable this to access the Texture data from scripts using Texture2D.SetPixels, Texture2D.GetPixels and other Texture2D methods. Internally, Unity uses a copy of the Texture data for script access, which doubles the amount of memory required for the Texture. This property is therefore disabled by default, and you should enable it only if you require script access. For more information, see Texture2D. |
| Streaming Mip Maps | Enable this checkbox to use Texture Streaming on this Texture. This setting is valid for any Texture in the 3D environment that Unity displays with a Mesh Renderer. Diffuse Textures, normal maps and light maps are all valid for Texture Streaming. |
| Mip Map Priority | Use this to set the priority of the mipmap. Unity uses this to determine which mipmaps to prioritize when assigning resources. Higher values represent a higher priority (for example, 3 is a higher priority than 1). This setting is only available when Streaming Mip Maps is enabled. The Mip Map Priority number is also a mipmap offset for the Memory Budget (set in the Quality Settings when Texture Streaming is enabled). For example, with a priority of 2, the Texture Streaming system tries to use a mipmap two mip levels higher than Textures with a priority of 0. One mip level higher is 2x in each axis and two levels higher is 4x in each axis, so two mip levels higher results in a texture 16x larger. If it can’t do this, it uses a lower mip level to fit the Memory Budget. Negative values are also valid. See Texture Streaming API for more details. |
| Generate Mip Maps | Check this box to enable mipmap generation. Mipmaps are smaller versions of the Texture that get used when the Texture is very small on screen. See documentation on Importing Textures for more information on mipmaps. |
| Border Mip Maps | Check this box to avoid colors bleeding out to the edge of the lower MIP levels. Used for light cookies (see below). This box is unchecked by default. |
| Mip Map Filtering | There are two ways of mipmap filtering available for optimizing image quality. The default option is Box. |
| Box | This is the simplest way to fade out mipmaps. The MIP levels become smoother as they go down in dimension size. |
| Kaiser | A sharpening algorithm runs on the mipmaps as they go down in dimension size. Try this option if your Textures are too blurry in the distance. (The algorothm is of a Kaiser Window type - see Wikipedia for further information.) |
| Mip Maps Preserve Coverage | Enable this checkbox if you want the alpha channel of generated mipmaps to preserve coverage during the alpha test. See TextureImporterSettings.mipMapsPreserveCoverage for more information. |
| Fadeout Mip Maps | Enable this to make the mipmaps fade to gray as the MIP levels progress. This is used for detail maps. The left-most scroll is the first MIP level to begin fading out. The right-most scroll defines the MIP level where the Texture is completely grayed out. |
| Wrap Mode | Select how the Texture behaves when tiled. The default option is Clamp. |
| Repeat | Repeats the Texture in tiles. |
| Clamp | Stretches the Texture’s edges. |
| Mirror | Mirrors the Texture at every integer boundary to create a repeating pattern. |
| Mirror Once | Mirrors The texture once, then clamps it to edge pixels. |
| Per-axis | Choose this to individually control how Unity wraps Textures at the U axis and V axis. |
| Filter Mode | Select how the Texture is filtered when it gets stretched by 3D transformations. The default option is Point (no filter). |
| Point (no filter) | The Texture appears blocky up close. |
| Bilinear | The Texture appears blurry up close. |
| Trilinear | Like Bilinear, but the Texture also blurs between the different MIP levels. |
| Aniso Level | Increases Texture quality when viewing the Texture at a steep angle. Good for floor and ground Textures. See documentation on Importing Textures for more information on Anisotropic filtering. |
Platform-specific overrides
The Texture Inspector window has a Platform-specific overrides panel.
When building for different platforms, you need to think about the resolution, the file size with associated memory size requirements, the pixel dimensions, and the quality of your Textures for each target platform. Use the Platform-specific overrides panel to set default options (using Default), and then override them for a specific platform using the buttons along the top of the panel.
| Property: | Function: |
|---|---|
| Max Size | The maximum imported Texture dimensions in pixels. Artists often prefer to work with huge dimension-size Textures; use Max Size to scale the Texture down to a suitable dimension-size. |
| Resize Algorithm | The algorithm used to downscale the Texture when the Texture dimensions are larger than the specified Max Size. |
| Mitchell | The Texture is resized using the Mitchell algorithm. This is the default resize algorithm. |
| Bilinear | The Texture is resized using bilinear interpolation. For images where small, sharp details are important, this might might preserve more of these details than Mitchell. |
| Compression | Choose the compression type for the Texture. This parameter helps the system choose the right compression format for a Texture. Depending on the platform and the availability of compression formats, different settings might end up with the same internal format (for example, Low Quality Compression has an effect on mobile platforms, but not on desktop platforms). |
| None | The Texture is not compressed. |
| Low Quality | The Texture is compressed in a low-quality format. This results in a lower memory usage compared with Normal Quality. |
| Normal Quality | The Texture is compressed with a standard format. |
| High Quality | The Texture is compressed in a high-quality format. This results in a higher memory usage compared with Normal Quality. |
| Format | This bypasses the automatic system to specify what internal representation is used for the Texture. The list of available formats depends on the platform and Texture type. See documentation on Texture formats for platform-specific overrides for more information. Note: Even when a platform is not overridden, this option shows the format chosen by the automatic system. The Format property is only available when overriding for a specific platform, and not as a default setting. |
| Use crunch compression | Use crunch compression, if applicable. Crunch is a lossy compression format on top of DXT or ETC Texture compression. Textures are decompressed to DXT or ETC on the CPU and then uploaded on the GPU at runtime. Crunch compression helps the Texture use the lowest possible amount of space on disk and for downloads. Crunch Textures can take a long time to compress, but decompression at runtime is very fast. |
| Compressor Quality | When using Crunch Texture compression, use the slider to adjust the quality. A higher compression quality means larger Textures and longer compression times. |
2017–09–18 Page amended
Crunch compression format updated in 2017.3 NewIn20173