Why is the browser stuck when visualizing the generated surface mesh?

[BoyuLyu]

I have been trying to visualize a large volume, with 2000x2000x1000 voxels. I created a configuration file using CloudVolume.create_new_info, which I set the chunk to be 100x100x50 voxels. And then I use the following code to create downsampled data and visualizing in neuroglancer. However, when I tried to visualize the mesh in the neuroglancer, it become very laggy, which is almost impossible to interact with. I am wondering if there were ways to make it faster for visulization? I tried downsample the image with --mip-level 4 added, but still it was not helping.

igneous image downsample file://./ --mip 0 --queue ./ds-queue 
igneous --parallel 20 execute -x ./ds-queue
igneous mesh forge file://./ --mip 0 --queue ./mesh-queue 
igneous --parallel 20 execute -x ./mesh-queue
igneous mesh merge file://./ --queue ./mesh-queue 
igneous --parallel 20 execute -x ./mesh-queue
igneous view ./ --port 6220

[william-silversmith]

I think i see what the problem is. Try meshing from a higher mip level, that will radically simplify the meshes. Usually I try to pick a near isotropic mip level.

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On Fri, Oct 6, 2023, 1:02 PM HHHIT ***@***.***> wrote: I have been trying to visualize a large volume, with 2000x2000x1000 voxels. I created a configuration file using CloudVolume.create_new_info, which I set the chunk to be 100x100x50 voxels. And then I use the following code to create downsampled data and visualizing in neuroglancer. However, when I tried to visualize the mesh in the neuroglancer, it become very laggy, which is almost impossible to interact with. I am wondering if there were ways to make it faster for visulization? I tried downsample the image with --mip-level 4 added, but still it was not helping. igneous image downsample file://./ --mip 0 --queue ./ds-queue igneous --parallel 20 execute -x ./ds-queue igneous mesh forge file://./ --mip 0 --queue ./mesh-queue igneous --parallel 20 execute -x ./mesh-queue igneous mesh merge file://./ --queue ./mesh-queue igneous --parallel 20 execute -x ./mesh-queue igneous view ./ --port 6220 — Reply to this email directly, view it on GitHub <#160>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AATGQSKOVZGJCD2K47XO2S3X6A2T5AVCNFSM6AAAAAA5WDGROCVHI2DSMVQWIX3LMV43ASLTON2WKOZRHEZTANRSGYYTENA> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[BoyuLyu]

Thank you. Now, with the mip-level 4 as the input for generating the mesh, I can visualize in the browser more smoothly. However, the quality is really bad due to the low resolution. I am wondering if I can generate more levels of mesh? so that when I zoom in, the finer details of the mesh will be displayed.

[william-silversmith]

Yes, you can do that by generating the sharded multi-resolution meshes.

[BoyuLyu]

Is the parameter nlod used to decide how many levels of mesh to generate?

[william-silversmith]

Yes, it sets the max number to generate though not the precise number.

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On Sun, Oct 8, 2023, 5:42 PM HHHIT ***@***.***> wrote: Is the parameter nlod used to decide how many levels of mesh to generate? — Reply to this email directly, view it on GitHub <#160 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AATGQSO36PGTFFPLPGW6373X6MM5PAVCNFSM6AAAAAA5WDGROCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTONJSGE3DSMZVGQ> . You are receiving this because you commented.Message ID: ***@***.***>

[BoyuLyu]

Thanks a lot! I have tried using the shared format, but I still found it only displays the mesh with only one resolution. Are there any issues in my following command? Thanks,

igneous image downsample file://./ --mip 0 --num-mips 4 --queue ./ds-queue
igneous --parallel 20 execute -x ./ds-queue/
igneous mesh forge file://./ --mip 4 --queue ./mesh-queue --sharded 
igneous --parallel 20 execute -x ./mesh-queue
igneous mesh merge-sharded file://./ --queue ./mesh-queue --nlod 4
igneous --parallel 20 execute -x ./mesh-queue  
igneous view ./ --port 6220

[william-silversmith]

I think you'll want to forge from a lower mip level for meshing if you want the multi-res stuff to be usable. The mip level sets the floor on the resolution you can obtain.