ios intro to 3d graphics with metal
TRANSCRIPT
SOME NUMBERS
• One frame of 1920x1080 is over 8MB of data
• 60fps gives ~ 17ms to render a frame
• Witcher 3’s world area is about 136km2 - one meter spaced grid (awful) takes over 2GB alone
• 7
AND SOME PHYSICS• Light is weird - and really complicated (also computationally)
• Luminosity has a VERY big range, which your eyes can somewhat cope with - but you monitor can’t
• Atomic structure of an object heavily influences it’s interaction with light
• Water has no color - but it reflects, refracts and diffracts light
• Modelling water (liquid, gas) movement is hard
HDR
“Ahh, it’s nothing what it really looks like”
Simple shadow changes perception a lot
I really like these illusions and I need more slides with pictures
Let’s do this!
SIMPLE PROJECTION
JUST KIDDING
But your program is really going to do this
VERTICES
FRAGMENTS
Decent per-fragment shading with very simple geometry
TEXTURING
More than just images
CPU VS GPU
Multipurpose vs streamlined
PIPELINE
PIPELINE IN CODE
RENDER PASS
SHADERS
DEMO TIME
OVER THE HUMPMeans it’s downhill from now on
TEXTURING AIN’T SO EASY
LET’S ADD SHADOWS
Surfaces shading themselves thanks to floating point errors
JUST ADD A MARGIN AND…
Our object appears to be floating above the ground
COSTLY DETAILS
Small color differences, big effect
WHY LEARN METAL
• Multicore machines are standard, OpenGL is inherently one thread only, pipeline stall is still a thing
• OpenGL started as an abstraction that hid the GPU altogether - your program might still revert to CPU rendering without a warning
• Deprecated APIs everywhere, nothing was ever removed
• Backwards compatibility means magic arguments to functions that used to do something completely different
• Really hard for beginners, practically impossible/inviable to master
Or why you shouldn’t bother with OpenGL
DEBUGGING
“You forgot to unbind a buffer here”
MEANWHILE, IN METAL• Designed for multithreaded processing
• Simplifies interaction with GPU instead of pretending it’s not there
• Clean, well documented API
• Helpful assertions everywhere, compile-time errors for shaders, debugging facilities
Thanks!
Contact: [email protected]
@Sigmapoint_pl
Images from the Interwebs:http://www.moline.com/equip%20cutters%20dies.htm
http://computersnetto.blogspot.com/2015/02/old-computers.htmlhttp://smashinghub.com/amazing-optical-illusion-photos.htm
http://http.developer.nvidia.com/GPUGems/gpugems_ch25.htmlhttps://www.opengl.org/discussion_boards/showthread.php/162308-per-vertex-lighting-vs-per-pixel-lighting/page2
http://www.3dgep.com/rendering-and-special-effects-in-unity-3-5/https://commons.wikimedia.org/wiki/File:Swiss_army_knife_closed_20050612.jpg
http://www.game-debate.com/blog/?b_id=1943&author=TeroMarsu&title=Graphical%20Effects%20Explained&page=2http://www.fabiensanglard.net/shadowmapping/index.php
http://www.independentdeveloper.com/archive/2007/12/08/ac3d-plugin-nmf-ati-normal-map-exporterhttps://www.flickr.com/photos/sudhee/82891943
www.sigmapoint.pl