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• 2D shader to draw representation of rotating sphere.

  - by TheBigO

  I want to display a 3D textured sphere, and then rotate it in one direction. The direction will never change, and the camera will never move. One way is to actually create a spherical mesh, map a texture to it, rotate the sphere, and render in 3D. My question is, is there a way to display a 2D circle, that looks like a rotating sphere, with just a 2D shader. In other words, can someone think of a trick, like mapping a texture to the circle in a particular way, to give the appearance of an in-place rotating sphere, that is always viewed from the side? I don't need exact shader code, I'm just looking for the right idea.

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• HLSL: Pack 4 values into 32 bit float.

  - by TheBigO

  I can't find any useful information on packing 4 values into a 32 bit float in HLSL. Ideally, what I want to be able to do in HLSL is: float4 values = ... // Some values where each component is between 0 and 1. float packedValues = pack32R(values); float4 values2 = unpack32R(packedValues); I realize that there will be precision limitations, and performance tradeoffs between different precisions in different methods. I'm just wondering what ideas are out there.

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• Cronjob terminates early

  - by TheBigO

  In my crontab file I execute a script like so (I edit the crontab using sudo crontab -e): 01 * * * * bash /etc/m/start.sh The script runs some other scripts like so: sudo bash -c "/etc/m/abc.sh --option=1" & sleep 2 sudo bash -c "/etc/m/abc.sh --option=2" & When cron runs the script start.sh, I do ps aux | grep abc.sh and I see the abc.sh script running. After a couple of seconds, the script is no longer running, even though abc.sh should take hours to finish. If I do sudo bash /etc/m/start.sh & from the command line, everything works fine (the abc.sh scripts run for hours in the background until they complete). How do I debug this? Is there something I'm doing that is preventing these scripts from running in the background until they are done?

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• Maintaing list order in binary tree.

  - by TheBigO

  Given a sequence of numbers, I want to insert the numbers into a balanced binary tree such that when I do a preorder traversal on the tree, it gives me the sequence back. How can I construct the insert method corresponding to this requirement? Remember that the tree must be balanced, so there isn't a completely trivial solution. I was trying to do this with a modified version of an AVL tree, but I'm not sure if this can work out.

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