[martincollignon]

Problem

three r187 made Texture.mipmaps always an array and removed the mipmaps && / mipmaps !== undefined guards in WebGLTextures (mrdoob/three.js#35081). setupRenderTarget now reads renderTarget.texture.mipmaps.length directly.

On three >= 162, WebGLMultipleRenderTargetsCompat overrides get texture() to return this.textures, which is an array. An array has no mipmaps, so with halfRes: true every render throws as soon as the depthDownsampleTarget is bound:

TypeError: Cannot read properties of undefined (reading 'length')
    at WebGLTextures.setupRenderTarget

Both N8AOPass and N8AOPostPass are affected. halfRes: false is not, because the compat target is only created for half resolution.

Fix

Remove the texture getter from the >= 162 branch of src/compat.js. It isn't needed there: N8AO only reads the downsample target through .textures[i], and WebGLRenderTarget created with { count } already exposes texture as textures[0]. The < 162 branch is unchanged. dist/ and the example bundles are rebuilt with npm run build; the only change in each is the same three removed lines.

Reproduction

A plain page: three's EffectComposer with N8AOPass, or postprocessing's EffectComposer → RenderPass → N8AOPostPass, with configuration.halfRes = true, rendering 5 frames.

	three 0.186.1 + postprocessing 6.39.5	three 0.187.0 + postprocessing 6.39.6
n8ao 2.0.1, half-res	5/5 frames	0/5, throws (both passes)
this PR, half-res	5/5	5/5
either, halfRes: false	5/5	5/5

With this PR, the N8AOPostPass half-res output on r187 is pixel-identical to n8ao 2.0.1 on r186 (max channel difference 0).

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