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Pema99

@pema99.bsky.social

290 followers 270 following 41 posts

Senior Graphics Engineer, Light Transport @unity.com. Check out my stuff at http://github.com/pema99 and https://pema.dev Interested in all things graphics, VR, language dev and functional programming. @pemathedev on Twitter/X.

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Pema99 @pema99.bsky.social · May 10

I wrote a blog post about mipmap level selection. pema.dev/2025/05/09/m...

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Pema99 @pema99.bsky.social · 9d

block (singular) game

Reposted by Pema99

orels1 @orels1.bsky.social · 10d

Its been a month since i started using @gingerbill.org 's Odin language, so I feel compelled to finally write something about that
For context: I'm working on a little steamvr overlay tool in my free time. The goal is to learn more about steamvr and to write something lower level than i usually do

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Pema99 @pema99.bsky.social · 13d

12 angry men (1957)

Pema99 @pema99.bsky.social · Sep 2

Remember what they took from us

Reposted by Pema99

Zekk @zekk.dev · Aug 19

🔷I've just released my soft outline shader!🔷

Do bloom-like effects on your avatar without post processing or screen effects! Vid has examples!

15% off for the first 48 hours!⬇️Link Below!⬇️

I am also doing a giveaway, like❤️, repost 🔁, and follow to enter!

#VRChat #ZekkDev

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Pema99 @pema99.bsky.social · Aug 10

pretty

Reposted by Pema99

Alex Mueller @lexdev.net · Aug 6

We are looking for a Vulkan engineer to join our render team at IOI! Available locations are Copenhagen, Malmo and Barcelona. Feel free to reach out if you are interested or have question 😄
ioi.dk/careers?pane...

IOI Careers

Welcome to IOI Careers. Explore open jobs, and dive into our five unique studios across Copenhagen, Malmö, Barcelona, Istanbul, and Brighton.

ioi.dk

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Reposted by Pema99

wunk @wunk.bsky.social · Aug 3

📐

#art

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Reposted by Pema99

tupper @dtupper.com · Jul 30

lmao

UploadVR @uploadvr.com · Jul 29

Meta is telling developers that the ideal VR session length with today's hardware is 20-40 minutes, and has explained its reasoning:

Meta Explains Why The Ideal VR Session Is 20-40 Minutes

Meta is telling developers that the ideal VR session length with today's hardware is 20-40 minutes, and has explained its reasoning.

www.uploadvr.com

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Pema99 @pema99.bsky.social · Jul 29

Reposted by Pema99

RED_SIM @sim.red · Jul 1

Light Volumes 2.0 will support baked 3D shadows for point and spot lights, and that's how it can be used!
Thanks to @pema99.bsky.social for implementing this feature!

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Reposted by Pema99

Lionel Lemarié @hikey.org · Jun 27

Want to do a quick photon mapping test, but it's a slow start because I spent most of the time so far playing with the debug rays instead. It does immediately show that the basic GPU hash rand I used is no good.
#metalrt #rendering

Photons are shot from two point lights (a blue and a red one). They are recorded in a buffer, then added to the scene BVH as spheres and thin cylinders, with emission from the flux.

Photons are shot from the area light. The distribution is horrendous and needs a little work.

Photons are shot from the area light. The distribution is tweaked a bit but still bad.

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Pema99 @pema99.bsky.social · Jun 26

(Tarkus, 1972, Emerson Lake and Palmer)

Pema99 @pema99.bsky.social · Jun 26

What album or artist would you say profoundly reshaped the way YOU perceive music?

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Reposted by Pema99

RED_SIM @sim.red · Jun 8

Area Light Volumes... Thanks to @pema99.bsky.social for implementing and contributing such an amazing feature to VRC Light Volumes! I can already imagine people using it as studio softboxes for photography!

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Reposted by Pema99

d4rkpl4y3r @d4rkpl4y3r.bsky.social · May 20

I made my fluid sim particles got towards the nearest light from the light volumes.
youtu.be/i8PFoagQhP0

Particle gravity towards VRC Light Volume light direction

YouTube video by d4rkpl4y3r

youtu.be

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Reposted by Pema99

passivestar @passivestar.bsky.social · Mar 2

reflection probe any% world record

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Reposted by Pema99

mjp @mjp123.bsky.social · Apr 14

In today's new blog post, I try to provide some intuition and clear up some misconceptions about early Z cull behavior on desktop GPUs. Have a read if that interests you!
therealmjp.github.io/posts/to-ear...

To Early-Z, or Not To Early-Z

Depth In The Logical Rendering Pipeline Where Does Early-Z Fit In? When Does Early-Z Have To Be Disabled? Discard/Alpha Test Pixel Shader Depth Export UAVs/Storage Textures/Storage Buffers Forcing Ear...

therealmjp.github.io

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Pema99 @pema99.bsky.social · May 11

good riddance

Reposted by Pema99

Mykhailo Moroz @michael-moroz.bsky.social · May 11

Slang can be made extremely close to GLSL/Shadertoy style of shaders by using a set of defines and typealiases, I've made a template in compute.toyts just for that compute.toys/view/1947
I also ported my most popular shadertoy using it:
compute.toys/view/1948

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Pema99 @pema99.bsky.social · May 11

This is a fun story, thanks for sharing :) I'm gonna refrain from looking at the patent, as I do for all software patents.

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Pema99 @pema99.bsky.social · May 11

I did notice a single line in the DX11.3 spec "D3D11.3 will allow approximations to this effect." but didn't see something similar for the GLES3.2 spec. Taking another look now, I realize there is a similar approximation blurb, it was just hiding on the next page, heh

Pema99 @pema99.bsky.social · May 11

Hmm.. I see what you mean. Here's the plot with your suggestion:

Pema99 @pema99.bsky.social · May 11

Interestingly, the GLES3.2 spec amends the relevant section to _very briefly_ mention elliptical footprint. Vulkan spec has a similar small paragraph. Seems to me like that would put Mesa in violation of both specs?

Reposted by Pema99

レイレイ @lei-lei.bsky.social · May 11

one of the curious things I try with different GPUs is r_colorMipLevels 1 in q3dm1 on Quake3

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