yaustar
December 19, 2022, 2:21pm
13
Assuming you would be using the project I linked to above, you would have to compress the textures in the GLB before importing them into PlayCanvas.
You would also have to import the Basis library into the PlayCanvas project.
You mean we could compress(basis) the textures outside the playcanvas? How can we do this? any tool?
yaustar
December 19, 2022, 2:30pm
15
I don’t know any tools offhand but you would be looking for something that would do KTX2 texture compression
# KTX Artist Guide
How artists and content creators can compress glTF textures with [Basis Universal texture compression](https://github.com/KhronosGroup/KTX-Software) and the glTF extension [KHR_texture_basisu](https://github.com/KhronosGroup/glTF/blob/master/extensions/2.0/Khronos/KHR_texture_basisu/).
## Why use KTX?
Textures in a glTF file can be compressed into .ktx2 GPU textures using Basis Universal compression, which offers faster GPU upload and less GPU memory consumption than PNG or JPEG textures. PNGs and JPEGs are fully uncompressed when loaded in GPU memory, but KTX stays compressed on the GPU.
Authoring compressed GPU textures often requires more careful tuning to maintain image quality, but this extra effort is worthwhile for applications that need to maintain a smooth framerate while uploading images, or where GPU memory is limited. In certain cases they may also have smaller file sizes than PNG or JPEG textures, but this is not guaranteed. If performance is important, the benefits of compressed GPU textures may outweigh an increase in file size.
There are two Basis Universal compression methods: ETC1S and UASTC.
ETC1S offers greater compression and works better with large areas of solid colors or mostly monochromatic values; it doesn’t produce quality results on complex textures, or textures with areas of saturated color next to each other. ETC1S is useful when texture variation is not that important. It's especially good with non-PBR textures, for example with toon rendering or with interface assets.
UASTC offers higher visual quality for high-contrast high-detail color textures. It works better with "packed" textures that have very different values in RGB channels, including Occlusion/Roughness/Metalness (ORM), Normal, and textures used by [glTF Extensions](https://github.com/KhronosGroup/glTF/tree/master/extensions) like KHR_materials_clearcoat which uses the Red channel for clearcoatTexture and the Green channel for clearcoatRoughnessTexture.
show original
gltf transform can be used from command line and can apply mesh / texture compressions
2 Likes
Thank you Steven,
To visulize the imported glb in the editor is very important to us
yaustar
December 19, 2022, 3:11pm
20
It was already answered this (UK) morning
Many thanks, I got it! Just missed it
How to change materials of heart at runtime?
With the model loaded by this script, I can get the material using the following method, but I can’t change it at present
Is there any good method or case for reference？
yaustar
December 21, 2022, 9:44am
23
What you have done is correct, you will just need to change the material on the meshInstance via https://developer.playcanvas.com/api/pc.MeshInstance.html#material
Is my writing wrong? I get the color of the material but can’t change it
yaustar
December 21, 2022, 10:34am
25
Can you possible a project that shows the issue please?
yaustar
December 21, 2022, 11:08am
27
The issue is that you didn’t parse the loadGlb script for the new color attribute so this.color is null
After parsing, it works as expected
okay，I know what the problem is. thx
Can the entities added in the script have custom names(entity name)?
yaustar
December 22, 2022, 10:23am
30
Does the loaded glb have a callback?I want to use ‘ready’ during initialization, but it doesn’t seem to work
yaustar
December 22, 2022, 10:32am
32
That commented code should work. Can you please post a new project with the issue?
yaustar
December 23, 2022, 11:09am
33
