shyoo
December 28, 2018, 2:06am
1
Hi I’m testing about CRN(DXT) texture for B3dm.
**I think **
current cesium (1.5x) has no ability to load mipmaps in compressed texture(ex. dxt with mipmaps) yet.
var mipmap =
(!(defined(internalFormat) && PixelFormat.isCompressedFormat(internalFormat))) &&
((sampler.minificationFilter === TextureMinificationFilter.NEAREST_MIPMAP_NEAREST) ||
(sampler.minificationFilter === TextureMinificationFilter.NEAREST_MIPMAP_LINEAR) ||
(sampler.minificationFilter === TextureMinificationFilter.LINEAR_MIPMAP_NEAREST) ||
(sampler.minificationFilter === TextureMinificationFilter.LINEAR_MIPMAP_LINEAR));
…
// GLTF_SPEC: Support TEXTURE_CUBE_MAP. https://github.com/KhronosGroup/glTF/issues/40
if (mipmap) {
tx.generateMipmap();
}
``
Have any plan to implement it?
thanks cesium team.
Shyoo.
omar
January 2, 2019, 6:57pm
2
We actually just recently implemented this (loading KTX) in order to support HDR images for image-based lighting (IBL). This is the class:
import when from '../ThirdParty/when.js';
import Check from './Check.js';
import CompressedTextureBuffer from './CompressedTextureBuffer.js';
import defined from './defined.js';
import PixelFormat from './PixelFormat.js';
import Resource from './Resource.js';
import RuntimeError from './RuntimeError.js';
import WebGLConstants from './WebGLConstants.js';
/**
* Asynchronously loads and parses the given URL to a KTX file or parses the raw binary data of a KTX file.
* Returns a promise that will resolve to an object containing the image buffer, width, height and format once loaded,
* or reject if the URL failed to load or failed to parse the data. The data is loaded
* using XMLHttpRequest, which means that in order to make requests to another origin,
* the server must have Cross-Origin Resource Sharing (CORS) headers enabled.
* <p>
* The following are part of the KTX format specification but are not supported:
* <ul>
* <li>Big-endian files</li>
* <li>Metadata</li>
show original
It should be able to load the mipmaps. Although I’m not sure if it’ll correctly use it when loading in b3dms. Do you have a sample file that you’ve tried?