Unprojecting the Mouse Cursor — Handmade Hero — Episode Guide

0:08Announcement: Miblo's Patreon

3:04Recap and set the stage for the day

4:16Run the game and see where we're at

5:41Consider moving away from explicitly constructing the debug hierarchy

8:51On writing the usage code and then unifying the systems

10:14handmade_sim_region.cpp: Look at how the entities are currently handled

11:09Implement the ability to click on an entity in order to inspect it

13:11Run the game and illustrate what we'd like to do

15:48handmade.cpp: Introduce DEBUGUI_DrawEntityOutlines

18:05Run the game and see the new outlines

18:34handmade_render_group.cpp: Make PushRectOutline additionally take a Thickness

19:06Run the game and see the thinner magenta outlines

19:59Consider the problem of the perspective transform

21:49handmade_render_group.cpp: Look at Unproject

23:19Blackboard: Why we need the distance from the camera

25:26Blackboard: Conceptualising this entity picking

27:08handmade.cpp: Unproject the MouseP

29:26handmade.cpp: Test the LocalMouseP against the 2D entity Volume->Dim

32:45handmade.cpp: Do a PushRect of the mouse's location

33:40handmade.cpp: Do an Orthographic call to draw the MouseP

36:27handmade_render_group.cpp: Add OffsetP and Scale to Orthographic

37:36Run the game and see the mouse

38:12Debugger: Step into GameUpdateAndRender and inspect the MouseP

39:09handmade.cpp: Try and draw the LocalMouseP

40:37Run the game and don't see the LocalMouseP

41:02handmade.render_group.cpp: Investigate why we're not seeing the LocalMouseP

43:44handmade.cpp: Multiply the mouse's Transform by PixelsToMeters

45:42Run the game and see that the rects aren't correctly positioned [tl;dw: see 1:39:32]

46:19handmade.cpp: Investigate why rects aren't correctly positioned

48:17handmade.cpp: Pass the entity's Transform to the Unproject call

49:07Run the game and see that we're getting a little closer

51:07handmade.cpp: Pick one entity to consider

51:28Run the game and see that the mouse's rectangle is incorrectly placed and scaled

52:16handmade.cpp: Try doing Unproject without the subtract

52:52Run the game and see that it's surprisingly in the right place

54:23handmade.cpp: Consider the possibility that Unproject may be fundamentally busted

54:47handmade.cpp: Add OffsetP.z to LocalZ

55:09Run the game and suggest that that's more correct

56:59handmade_render_group.cpp: Study our routines

1:02:15handmade.cpp: Try putting that subtract back in to the Unproject

1:05:28Run the game and try to determine how far off we are

1:06:00handmade.cpp: Try hardcoding values

1:07:32Run the game and don't see a MouseP rectangle

1:08:20handmade.cpp: Pass WorldMouseP to PushRect

1:08:57Run the game and see that it's okay, but not great

1:09:17handmade.cpp: Set LocalZ to 1.0f

1:11:21handmade.cpp: Add RenderGroup->Transform.DistanceAboveTarget to PushRect

1:14:17handmade_render_group.cpp: Introduce CompleteUnproject

1:22:27Run the game and conclude that we'll want to clean up what's happening in the projection

1:23:49Q&A

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1:23:49Q&A

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1:23:49Q&A

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1:24:18ijustwantfood The lag is real

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1:24:18ijustwantfood The lag is real

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1:24:18ijustwantfood The lag is real

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1:24:44conloncs How will the focal length factor in? Will you have FOV stuff?

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1:24:44conloncs How will the focal length factor in? Will you have FOV stuff?

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1:24:44conloncs How will the focal length factor in? Will you have FOV stuff?

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1:26:03insobot Elvin?

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1:26:03insobot Elvin?

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1:26:03insobot Elvin?

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1:26:20conloncs Semi related: What do you think about using different types for Points and Vectors?

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1:26:20conloncs Semi related: What do you think about using different types for Points and Vectors?

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1:26:20conloncs Semi related: What do you think about using different types for Points and Vectors?

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1:26:52Zamar037 Does the screen center need to be involved? It was used in CompleteUnproject

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1:26:52Zamar037 Does the screen center need to be involved? It was used in CompleteUnproject

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1:26:52Zamar037 Does the screen center need to be involved? It was used in CompleteUnproject

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1:27:10StarchyPancakes Is part of the problem that the code isn't normalizing the motion between the mouse and the entity relative to the screen dimensions in world coordinates at the different levels?

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1:27:10StarchyPancakes Is part of the problem that the code isn't normalizing the motion between the mouse and the entity relative to the screen dimensions in world coordinates at the different levels?

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1:27:10StarchyPancakes Is part of the problem that the code isn't normalizing the motion between the mouse and the entity relative to the screen dimensions in world coordinates at the different levels?

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1:28:03handmade.cpp: Try doing the MetersToPixels after the fact

1:28:43handmade_render_group.cpp: Check that there weren't any other transforms happening to PushRect

1:29:37abnercoimbre Mm. We seem to have run out of questions

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1:29:37abnercoimbre Mm. We seem to have run out of questions

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1:29:37abnercoimbre Mm. We seem to have run out of questions

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1:29:40cmuratori What is the problem with this Unproject?

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1:29:40cmuratori What is the problem with this Unproject?

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1:29:40cmuratori What is the problem with this Unproject?

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1:30:21handmade_render_group.cpp: Investigate the problem

1:32:26Meta-point: On the potential features of a development tool that would help with these types of problems

1:36:11Debugger: Inspect a bunch of values and copy them to a scratch buffer

1:39:32Owl of Shame Moment: We took out Z movement relative to the basis P

1:40:48handmade.cpp: Correctly set Transform.OffsetP

1:41:11Run the game and find it in the right place

1:44:17On getting bitten by a feature^α

1:44:39Lament this 2.5D nonsense

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1:44:39Lament this 2.5D nonsense

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1:44:39Lament this 2.5D nonsense

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1:45:15Glimpse into the future and wrap it up

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1:45:15Glimpse into the future and wrap it up

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1:45:15Glimpse into the future and wrap it up

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