This imports a 3-dimensional texture, which can then be used in custom shaders, as a [FogMaterial] density map or as a [GPUParticlesAttractorVectorField3D]. See also [ResourceImporterTexture] and [ResourceImporterTextureAtlas].
Controls how color channels should be used in the imported texture.
[b]sRGB Friendly:[/b], prevents the RG color format from being used, as it does not support sRGB color.
[b]Optimized:[/b], allows the RG color format to be used if the texture does not use the blue channel. This reduces memory usage if the texture's blue channel can be discarded (all pixels must have a blue value of [code]0[/code]).
[b]Normal Map (RG Channels):[/b] This forces all layers from the texture to be imported with the RG color format to reduce memory usage, with only the red and green channels preserved. This only has an effect on textures with the VRAM Compressed or Basis Universal compression modes. This mode is only available in layered textures ([Cubemap], [CubemapArray], [Texture2DArray] and [Texture3D]).
Controls how VRAM compression should be performed for HDR images.
[b]Disabled:[/b] Never use VRAM compression for HDR textures, regardless of whether they're opaque or transparent. Instead, the texture is converted to RGBE9995 (9-bits per channel + 5-bit exponent = 32 bits per pixel) to reduce memory usage compared to a half-float or single-precision float image format.
[b]Opaque Only:[/b] Only uses VRAM compression for opaque HDR textures. This is due to a limitation of HDR formats, as there is no VRAM-compressed HDR format that supports transparency at the same time.
[b]Always:[/b] Force VRAM compression even for HDR textures with an alpha channel. To perform this, the alpha channel is discarded on import.
[b]Note:[/b] Only effective on Radiance HDR ([code].hdr[/code]) and OpenEXR ([code].exr[/code]) images.
If [code]true[/code], uses BPTC compression on desktop platforms and ASTC compression on mobile platforms. When using BPTC, BC7 is used for SDR textures and BC6H is used for HDR textures.
If [code]false[/code], uses the faster but lower-quality S3TC compression on desktop platforms and ETC2 on mobile/web platforms. When using S3TC, DXT1 (BC1) is used for opaque textures and DXT5 (BC3) is used for transparent or normal map (RGTC) textures.
BPTC and ASTC support VRAM compression for HDR textures, but S3TC and ETC2 do not (see [member compress/hdr_compression]).
The quality to use when using the [b]Lossy[/b] compression mode. Higher values result in better quality, at the cost of larger file sizes. Lossy quality does not affect memory usage of the imported texture, only its file size on disk.
If [code]true[/code], smaller versions of the texture are generated on import. For example, a 64×64 texture will generate 6 mipmaps (32×32, 16×16, 8×8, 4×4, 2×2, 1×1). This has several benefits:
- Textures will not become grainy in the distance (in 3D), or if scaled down due to [Camera2D] zoom or [CanvasItem] scale (in 2D).
- Performance will improve if the texture is displayed in the distance, since sampling smaller versions of the original texture is faster and requires less memory bandwidth.
The downside of mipmaps is that they increase memory usage by roughly 33% (for [Texture2DArray], [Cubemap] and [CubemapArray]) or 14% (for [Texture3D]).
It's recommended to enable mipmaps in 3D. However, in 2D, this should only be enabled if your project visibly benefits from having mipmaps enabled. If the camera never zooms out significantly, there won't be a benefit to enabling mipmaps but memory usage will increase.
Controls how the cubemap's texture is internally laid out. When using high-resolution cubemaps, [b]2×3[/b] and [b]3×2[/b] are less prone to exceeding hardware texture size limits compared to [b]1×6[/b] and [b]6×1[/b].
