了解 2D 纹理数组和 3D 纹理之间的区别?

问题描述

如果我理解正确，如果我将 TEXTURE_MIN_FILTER 设置为 NEAREST 那么 sampler2DArray/TEXTURE_2D_ARRAY 和 sampler3D/TEXTURE_3D

If I understand correctly, if I was to set TEXTURE_MIN_FILTER to NEAREST then there's not much difference between sampler2DArray/TEXTURE_2D_ARRAY and sampler3D/TEXTURE_3D

差异似乎是

• GenerateMipmap 会将交叉层与 3D 纹理混合，但不会混合 2D 数组
• 在 GLSL 中传递给 texture 的 Z 坐标对于 3D 纹理是 0 到 1，但在 2D 数组中是 0 到 N(深度).
• 如果过滤不是 NEAREST 3D 将跨层混合，2D 阵列不会.

• GenerateMipmap will blend cross layers with 3D textures but not 2D arrays
• the Z coordinate passed to texture in GLSL is 0 to 1 with 3D textures but an 0 to N (depth) in 2D arrays.
• If filtering is not NEAREST 3D will blend across layers, 2D array will not.

正确吗?

推荐答案

不正确.还有一个区别:mipmap 大小.

Incorrect. There's one more difference: mipmap sizes.

在 3D 纹理中，宽度、高度和深度都随着 mipmap 尺寸的减小而减小.在二维数组纹理中，每个 mipmap 级别具有相同 数量的数组层；只有宽度和高度减少.

In a 3D texture, the width, height, and depth all decrease at lower mipmap sizes. In a 2D array texture, every mipmap level has the same number of array layers; only width and height decrease.

这不仅仅是混合和一些纹理坐标奇怪的问题；纹理数据的大小是不同的.它是一种非常不同的种类纹理，不同于 3D 纹理，就像 2D 纹理与 1D 纹理一样.

It's not just a matter of blending and some texture coordinate oddities; the very size of the texture data is different. It is very much a different kind of texture, as different from 3D textures as 2D textures are from 1D textures.

这也是您无法创建 3D 纹理的视图纹理的原因一个二维数组，反之亦然.

This is also why you cannot create a view texture of a 3D texture that is a 2D array, or vice-versa.

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