Normal map Import Settings reference

The Normal mapA type of Bump Map texture that allows you to add surface detail such as bumps, grooves, and scratches to a model which catch the light as if they are represented by real geometry.
See in Glossary texture type formats the texture asset so it’s suitable for real-time normal mapping. With this texture type, you can also set the Texture Shape.

Properties

Property	Description
Create From Grayscale	Indicates whether to create the normal map from a grayscale heightmap.
Bumpiness	Controls the amount of bumpiness. A low bumpiness value means that even sharp contrast in the heightmap is translated to gentle angles and bumps. A high value creates exaggerated bumps and very high-contrast lighting responses to the bumps. This property is visible only when Create from Grayscale is set to true.
Filtering	Specifies how to calculate the bumpiness.
	Sharp	Generates Normal Maps that are sharper than standard normal maps.
	Smooth	Generates normal maps with standard (forward differences) algorithms.
Flip Green Channel	Indicates whether to invert the green (Y) channel values of a normal map. This can be useful if the normal map uses a different convention to what Unity expects.
Non Power of 2	Specifies how Unity scales the dimension size if the texture source file has a non-power of two (NPOT) dimension size. For more information on NPOT dimension sizes, see Importing Textures.
	None	Texture dimension size stays the same.
	To nearest	Scales the Texture 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	Scales the Texture 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	Scales the Texture 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	Indicates whether 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.
Virtual Texture Only	Indicates whether to use the texture solely in combination with a Texture Stack for Virtual Texturing. When enabled, the texture is not guaranteed to be available as a Texture2D in the Player (that is, not accessible from a script). When disabled, the Player includes the texture both as a Texture2D (accessible from script) and as a streamable texture in a Texture Stack.
Generate Mipmaps	Indicates whether to generate mipmaps for this texture.
Use Mipmap Limits	Disable this option to use all mipmap levels, regardless of the Mipmap Limit settings in the Quality menu. This property only appears if you set Texture Shape to 2D. Other texture shapes always use all mipmap levels.
Mipmap Limit Group	Select the Mipmap Limit group this texture should be part of. The default option is None (Use Global Mipmap Limit). This property only appears if you set Texture Shape to 2D or 2D Array. Other texture shapes always use all mipmap levels.
Mip Streaming	Indicates whether to use Mipmap Streaming for this texture. This property is visible only when Generate Mipmaps is set to true.
Mip Map Priority	The priority of the textures in the Mipmap Streaming system. Unity uses this setting in two ways: • To determine which textures to prioritize when assigning resources. • As a mip bias value when choosing a mip level that fits in the memory budget. For example, with a priority of 2, the mipmap streaming system tries to use a mipmap two mip levels higher than Textures with a priority of 0. Positive numbers give higher priority. Valid values range from –128 to 127.
Mipmap Filtering	Specifies the method Unity uses to filter mipmaps and optimize image quality. This property is visible only when Generate Mipmaps is set to true.
	Box	Makes mip levels smoother as they decrease in dimension size.
	Kaiser	Runs a sharpening algorithm on mipmaps as they decrease in dimension size. Use this option if your textures are too blurry when far away. The algorithm is of the Kaiser Window type. For more information, see Wikipedia.
Preserve Coverage	Indicates whether the alpha channel in generated mipmaps preserves coverage during the alpha text. For more information, see TextureImporterSettings.mipMapsPreserveCoverage. This property is visible only when Generate Mipmaps is set to true.
Alpha Cutoff	The reference value that controls the mipmap coverage during the alpha test. This property is visible only when Preserve Coverage is set to true.
Replicate Border	Indicates whether to stop colors bleeding out to the edge of the lower MIP levels. This is useful for light cookies. This property is visible only when Generate Mipmaps is set to true.
Fadeout to Gray	Indicates whether mipmaps should fade to gray as the mip levels progress. This is useful 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. This property is visible only when Generate Mipmaps is set to true.
Ignore PNG Gamma	Indicates whether to ignore the gamma attribute in PNG files. This option is only visible if the texture source file is a PNG.
Wrap Mode	Specifies how the texture behaves when it tiles.
	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. Note: Some mobile devices don’t support Mirror Once. In this case, Unity uses Mirror instead.
	Per-axis	Provides options you can use to individually control how Unity wraps textures on the U and V axis.
Filter Mode	Specifies how Unity filters the texture when the texture stretches during 3D transformations.
	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	Controls the texture quality when you view the texture at a steep angle. Anisotropic filtering is good for floor and ground Textures but is resource intensive. For more information, see Importing textures.

In addition, you can use the Platform-specific overrides panel to set default options and overrides for specific platforms.

Default Import Settings reference

Editor GUI and Legacy GUI Import Settings reference

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Normal map Import Settings reference

Properties