# \[BUG\] rounding error when rendering sprites
**URL:** https://forum.makecode.com/t/bug-rounding-error-when-rendering-sprites/45458
**Category:** Help
**Created:** [August 18, 2026, 10:06pm UTC](https://forum.makecode.com/t/bug-rounding-error-when-rendering-sprites/45458 "2026-08-18T22:06:43Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@VoxelMaster64](https://forum.makecode.com/u/VoxelMaster64)
#### Post date: [August 18, 2026, 10:06pm UTC](https://forum.makecode.com/t/bug-rounding-error-when-rendering-sprites/45458/1 "2026-08-18T22:06:43Z")
@richard , I think the sprite’s rendering is using the wrong rounding (Its using `x|0` but I think it needs to use `Math.round(x),`or the opposite for collisions), and it creates that bug. On a wall facing right, the player goes through it. On the wall facing left, the player walks on the air.
(the video quality is bad bc it’s a gif)
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### Author:  [@YamJam](https://forum.makecode.com/u/YamJam)
#### Post date: [August 19, 2026, 7:05pm UTC](https://forum.makecode.com/t/bug-rounding-error-when-rendering-sprites/45458/2 "2026-08-19T19:05:21Z")
What exactly does that mean? I know this is like galaxies too ahead of my level, but it sounds interesting and I want to know.
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### Author:  [@richard](https://forum.makecode.com/u/richard)
#### Post date: [August 19, 2026, 7:05pm UTC](https://forum.makecode.com/t/bug-rounding-error-when-rendering-sprites/45458/3 "2026-08-19T19:05:43Z")
nope, this is intended. we don’t use round because it’s slower
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### Author:  [@VoxelMaster64](https://forum.makecode.com/u/VoxelMaster64)
#### Post date: [August 20, 2026, 2:36am UTC](https://forum.makecode.com/t/bug-rounding-error-when-rendering-sprites/45458/4 "2026-08-20T02:36:44Z")
looked at the code a little bit, and `(v + 128) >> 8` rounds the number:
>
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### Author:  [@VoxelMaster64](https://forum.makecode.com/u/VoxelMaster64)
#### Post date: [August 20, 2026, 4:45pm UTC](https://forum.makecode.com/t/bug-rounding-error-when-rendering-sprites/45458/5 "2026-08-20T16:45:02Z")
@AlexK edit (forgot “rounds”):
looked at the code a little bit, and `(v + 128) >> 8` rounds the number:
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### Author:  [@VoxelMaster64](https://forum.makecode.com/u/VoxelMaster64)
#### Post date: [August 24, 2026, 4:58pm UTC](https://forum.makecode.com/t/bug-rounding-error-when-rendering-sprites/45458/6 "2026-08-24T16:58:43Z")
um @richard i think in the simulator, Math.floor is actually the tiniest bit faster (or at least on some js engines).
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### Author:  [@VoxelMaster64](https://forum.makecode.com/u/VoxelMaster64)
#### Post date: [August 24, 2026, 5:24pm UTC](https://forum.makecode.com/t/bug-rounding-error-when-rendering-sprites/45458/7 "2026-08-24T17:24:38Z")
(oops i accidentaly replied to YamJam)
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### Author:  [@WoofWoof](https://forum.makecode.com/u/WoofWoof)
#### Post date: [August 24, 2026, 10:59pm UTC](https://forum.makecode.com/t/bug-rounding-error-when-rendering-sprites/45458/8 "2026-08-24T22:59:25Z")
It needs to be faster on hardware, and bitwise ops are definitely the fastest there.
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### Author:  [@VoxelMaster64](https://forum.makecode.com/u/VoxelMaster64)
#### Post date: [September 19, 2026, 7:47pm UTC](https://forum.makecode.com/t/bug-rounding-error-when-rendering-sprites/45458/9 "2026-09-19T19:47:33Z")
maybe use shims? That makes the most sense because you could have the js version use Math.floor, and the cpp version use bitwise ops