Adding Raycasting to the Lighting — Handmade Hero — Episode Guide

0:17Recap and set the stage for the day

1:35Run the game and consider how we can improve the lighting quality

3:36Determine to work on directional shadowing or light bleeding

7:55Light transference between reflectors

13:04Blackboard: Cube mapped reflectors

17:16Gesture wildly^α

17:50Blackboard: The magic of the Z-buffer

20:14Blackboard: Emulating the effects of a Z-buffer in the lighting system

23:42Blackboard: Casting cones

26:23Blackboard: Ray / Plane Intersection

34:54Blackboard: Modelling reflectors as disks for the purposes of shadowing

42:16Determine to pick one reflector on which to do the computations

44:17Welcome votes to be freely cast in the chat^β

44:29On democracy...^γ

44:52...and oppression^δ

44:58handmade_render_group.cpp: Enable LightingTest() to pick and highlight a reflector for us to use

49:43Run the game and find our picked reflector

52:10handmade_render_group.cpp: Enable LightingTest() to isolate our test reflector in the compute lighting path

54:35Run the game and see that our test reflector didn't bleed out any light

56:10handmade_render_group.cpp: Enable LightingTest() to strengthen the yellow of our test reflector and run the game

57:17handmade_render_group.cpp: Enable LightingTest() to cast rays from our test reflector out into the scene

1:02:18Blackboard: Casting rays from the reflector

1:03:08handmade_render_group.cpp: Continue to enable LightingTest() to cast rays from our reflector

1:06:02Blackboard: Computing the intersection point of a ray with the plane of a reflector

1:07:24handmade_render_group.cpp: Start to enable LightingTest() to determine whether reflectors intersect

1:09:54Blackboard: Determining whether reflectors intersect

1:10:27handmade_render_group.cpp: Finish enabling LightingTest() to determine whether reflectors intersect and then compute shadowing for them

1:15:57Run the game to see that our test reflector is black

1:16:55handmade_world_mode.cp: Toggle off the hero's body and run the game again to see that our light does not affect the reflector

1:18:04handmade_world_mode.cpp: Increase the radius passed to PushLight() by UpdateAndRenderWorld()

1:19:18Step in to LightingTest() to inspect what it does

1:20:20handmade_render_group.cpp: Make LightingTest() only cast rays out of the front of our reflector

1:21:15Run the game to see that our light does light up our test reflector

1:21:54handmade_render_group.cpp: Try running the ray casting on everybody

1:22:38Run the game to see everyone apparently unlit

1:23:13handmade_render_group.cpp: Make LightingTest() cast out eight rays in many directions

1:25:24Run the game to see reflectors getting lit up

1:26:49handmade_render_group.cpp: Enable LightingTest() to perform cone-based ray tracing

1:27:56Run the game to see more pick-up of the light

1:28:55Blackboard: Needing to determine how much of a cone is being intersected

1:31:53handmade_render_group.cpp: Make LightingTest() generate 32 rays pointing in random directions

1:35:33Run the game to see the ray traced lighting, and increase the number of rays

1:38:20handmade_render_group.cpp: Reduce the number of rays to 16

1:40:17Step in to LightingTest() and inspect the rays

1:42:29handmade_render_group.cpp: Enable LightingTest() to cast narrow cones, and run the game

1:43:49handmade_render_group.cpp: Enable LightingTest() to direct rays more cleverly

1:46:56Run the game and note that we are getting a real shadowing solution now

1:48:22handmade_brain.cpp: Make ExecuteBrain() clamp the spring down

1:50:49Run the game and look at our lighting solution

1:52:09handmade_world_mode.cpp: Make AddStandardRoom() build a second wall

1:53:05Run the game to see how the walls occlude and reflect the light, with different numbers of lighting passes

1:56:06handmade_world_mode.cpp: Make AddStandardRoom() build different coloured walls

1:56:47Run the game to see how the two walls behave in the light

1:57:44handmade_render_group.cpp: Make LightingTest() increase the max emission

1:58:17Run the game to see the brighter light

2:00:18Q&A

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2:00:18Q&A

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2:00:18Q&A

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2:01:08qwindoo Are there engine features or ideas that emerged during the Handmade Hero streams and that you've since "backported" to the 1935 engine?

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2:01:08qwindoo Are there engine features or ideas that emerged during the Handmade Hero streams and that you've since "backported" to the 1935 engine?

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2:01:08qwindoo Are there engine features or ideas that emerged during the Handmade Hero streams and that you've since "backported" to the 1935 engine?

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2:02:45Miblo For the random series you picked (at random) 1234. Could it have made any sense to pick 360 there, for 360 degrees, or would absolutely any number do?

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2:02:45Miblo For the random series you picked (at random) 1234. Could it have made any sense to pick 360 there, for 360 degrees, or would absolutely any number do?

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2:02:45Miblo For the random series you picked (at random) 1234. Could it have made any sense to pick 360 there, for 360 degrees, or would absolutely any number do?

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2:05:39paulygon104 Probably the ingest server hiccuped or something

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2:05:39paulygon104 Probably the ingest server hiccuped or something

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2:05:39paulygon104 Probably the ingest server hiccuped or something

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2:07:12mtsmox I think you can keep files open in visual studio by clicking the icon next to the close icon

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2:07:12mtsmox I think you can keep files open in visual studio by clicking the icon next to the close icon

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2:07:12mtsmox I think you can keep files open in visual studio by clicking the icon next to the close icon

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2:09:49bigfellahull Tools > Options > Environment > Tabs and Windows > deselect allow new files to be opened in preview tab

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2:09:49bigfellahull Tools > Options > Environment > Tabs and Windows > deselect allow new files to be opened in preview tab

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2:09:49bigfellahull Tools > Options > Environment > Tabs and Windows > deselect allow new files to be opened in preview tab

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2:10:36bigfellahull Not related to lighting but I've been catching up with the multithreaded sim regions tonight and noticed that we never unset the entity active flag if an entity is not contained in the updatable bounds

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2:10:36bigfellahull Not related to lighting but I've been catching up with the multithreaded sim regions tonight and noticed that we never unset the entity active flag if an entity is not contained in the updatable bounds

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2:10:36bigfellahull Not related to lighting but I've been catching up with the multithreaded sim regions tonight and noticed that we never unset the entity active flag if an entity is not contained in the updatable bounds

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2:11:58handmade_sim_region.cpp: Enable BeginWorldChange() to clear the EntityFlag->Active

2:13:27handmade_world_mode.cpp: Let PlayWorld() call AddMonstar() and run the game

2:13:58handmade_world_mode.cpp: Let PlayWorld() put the snake in the world, and run the game to say hello to it

2:15:51handmade_entity.h and *.cpp: Add a Light entity_visible_piece_flag and make UpdateAndRenderEntities() call PushLight()

2:18:32handmade_world_mode.cpp: Introduce AddPieceLight()

2:20:47handmade_world_mode.cpp: Make AddSnakeSegment() call AddPieceLight()

2:22:09Run the game to see the lit up snake

2:24:16Run the game and note that our lighting scheme does not incur a cost per light source

2:25:54handmade_render_group.cpp: Enable LightingTest() to distribute light with no occlusion after some iterations, and run the game

2:28:43Brian ctray license question. May I continuously update my GitHub branch of your timer (ctray) code from Handmade Hero, until you say otherwise, meaning you are preemptively giving unlicense / public domain to any further code in that folder? Would you prefer I ask every time for permission so you don't need to worry? I can do whichever is more convenient to you

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2:28:43Brian ctray license question. May I continuously update my GitHub branch of your timer (ctray) code from Handmade Hero, until you say otherwise, meaning you are preemptively giving unlicense / public domain to any further code in that folder? Would you prefer I ask every time for permission so you don't need to worry? I can do whichever is more convenient to you

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2:28:43Brian ctray license question. May I continuously update my GitHub branch of your timer (ctray) code from Handmade Hero, until you say otherwise, meaning you are preemptively giving unlicense / public domain to any further code in that folder? Would you prefer I ask every time for permission so you don't need to worry? I can do whichever is more convenient to you

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2:29:14Close it down

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2:29:14Close it down

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2:29:14Close it down

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