Debugging the Raycaster — Handmade Hero — Episode Guide

0:01Welcome to Handmade Coffee, roasted by Irad¹ and presented to Casey at Handmade Seattle

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0:01Welcome to Handmade Coffee, roasted by Irad¹ and presented to Casey at Handmade Seattle

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0:01Welcome to Handmade Coffee, roasted by Irad¹ and presented to Casey at Handmade Seattle

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3:05Demo the current state of our raycast lighting

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3:05Demo the current state of our raycast lighting

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3:05Demo the current state of our raycast lighting

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8:13Cursorily reacquaint ourselves with EndLightingComputation()

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8:13Cursorily reacquaint ourselves with EndLightingComputation()

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8:13Cursorily reacquaint ourselves with EndLightingComputation()

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8:54Switch from TEST_LIGHT_TRANSFER to TEST_LIGHT_SPHERE in EndLightingComputation()

9:05Admire our radial falloff lighting solution, mixing four lights

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9:05Admire our radial falloff lighting solution, mixing four lights

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9:05Admire our radial falloff lighting solution, mixing four lights

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11:42Switch from TEST_LIGHT_SPHERE to TEST_LIGHT_TRANSFER in EndLightingComputation(), and let it assume that all rays hit light sources

12:44Admire our voxel-to-voxel interpolation

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12:44Admire our voxel-to-voxel interpolation

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12:44Admire our voxel-to-voxel interpolation

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13:25Make EndLightingComputation() draw a simple shadow if a light source is found to be occluded

14:54See our anomalous shadows

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14:54See our anomalous shadows

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14:54See our anomalous shadows

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15:35Toggle on the ray cast debug lines in EndLightingComputation()

15:56See our rays

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15:56See our rays

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15:56See our rays

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16:28Note that we are drawing a subset of 8³ out of 32³ rays

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16:28Note that we are drawing a subset of 8³ out of 32³ rays

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16:28Note that we are drawing a subset of 8³ out of 32³ rays

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18:44Disable lighting in CompileZBiasProgram()

19:14Look at our rays in bright light, to see some which hit non-obvious objects

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19:14Look at our rays in bright light, to see some which hit non-obvious objects

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19:14Look at our rays in bright light, to see some which hit non-obvious objects

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22:52Make EndLightingComputation() draw all the rays, coloured black if no hit, and yellow if hit

25:34Begin to reacquaint ourselves with RayCast()

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25:34Begin to reacquaint ourselves with RayCast()

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25:34Begin to reacquaint ourselves with RayCast()

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27:43Prevent RayCast() from initialising NegativeOne

28:06Continue to reacquaint ourselves with RayCast()

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28:06Continue to reacquaint ourselves with RayCast()

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28:06Continue to reacquaint ourselves with RayCast()

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36:56Consider making RayCast() base tCloseEnough on the particular box, such that boxes at the root of the hierarchy are more likely to be entered than boxes near the leaves

39:31Continue to reacquaint ourselves with RayCast()

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39:31Continue to reacquaint ourselves with RayCast()

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39:31Continue to reacquaint ourselves with RayCast()

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41:34Address the old early-out condition in RayCast() when all four rays hit

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41:34Address the old early-out condition in RayCast() when all four rays hit

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41:34Address the old early-out condition in RayCast() when all four rays hit

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44:11Delete the old all-hit early-out condition in RayCast(), and restrict the Box push to ones whose closest point it also closer than the current tRay

48:24Finish reacquainting ourselves with RayCast()

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48:24Finish reacquainting ourselves with RayCast()

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48:24Finish reacquainting ourselves with RayCast()

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50:41Look at our rays, and pick a problem one to isolate

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50:41Look at our rays, and pick a problem one to isolate

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50:41Look at our rays, and pick a problem one to isolate

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51:56Try to isolate our problem ray in EndLightingComputation()

53:40See that we picked the wrong ray

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53:40See that we picked the wrong ray

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53:40See that we picked the wrong ray

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53:59Fix our ray isolation in EndLightingComputation()

54:11See that we picked our desired problem ray

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54:11See that we picked our desired problem ray

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54:11See that we picked our desired problem ray

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54:25Add a BreakMePlease in EndLightingComputation()

55:03Break on our BreakMePlease in EndLightingComputation() and inspect our test case

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55:03Break on our BreakMePlease in EndLightingComputation() and inspect our test case

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55:03Break on our BreakMePlease in EndLightingComputation() and inspect our test case

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58:17Make RayCast() initialise AnyInside and AnyCloseEnough

59:25Break on our BreakMePlease in EndLightingComputation() and step through to RayCast()

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59:25Break on our BreakMePlease in EndLightingComputation() and step through to RayCast()

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59:25Break on our BreakMePlease in EndLightingComputation() and step through to RayCast()

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1:00:03Consider starting our camera at a known good location

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1:00:03Consider starting our camera at a known good location

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1:00:03Consider starting our camera at a known good location

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1:01:05Break on our BreakMePlease in EndLightingComputation(), skip the first frame, step through to RayCast() and inspect our test case

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1:01:05Break on our BreakMePlease in EndLightingComputation(), skip the first frame, step through to RayCast() and inspect our test case

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1:01:05Break on our BreakMePlease in EndLightingComputation(), skip the first frame, step through to RayCast() and inspect our test case

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1:08:47Our ray cast bug possibilities: 1) Erroneous box, correctly hit tested; 2) Correct box, erroneously hit tested

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1:08:47Our ray cast bug possibilities: 1) Erroneous box, correctly hit tested; 2) Correct box, erroneously hit tested

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1:08:47Our ray cast bug possibilities: 1) Erroneous box, correctly hit tested; 2) Correct box, erroneously hit tested

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1:10:27Enable RayCast() to draw its boxes, initially one ring of each

1:16:33Launch our debug build and see no ray cast box

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1:16:33Launch our debug build and see no ray cast box

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1:16:33Launch our debug build and see no ray cast box

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1:17:05Make EndLightingComputation() pass IsTestCast to RayCast()

1:17:39Check out our ray cast boxes

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1:17:39Check out our ray cast boxes

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1:17:39Check out our ray cast boxes

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1:18:08Make RayCast() draw the opposite ring of the boxes

1:18:25Check out our ray cast boxes

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1:18:25Check out our ray cast boxes

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1:18:25Check out our ray cast boxes

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1:19:04Make RayCast() draw the final edges of its boxes

1:19:47Check out our complete ray cast boxes

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1:19:47Check out our complete ray cast boxes

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1:19:47Check out our complete ray cast boxes

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1:21:29Make RayCast() colour hit boxes cyan if they are containers, and yellow if not

1:22:45Check out our ray cast boxes, noting the erroneously placed box, and the fact that our light probes are considered colliders

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1:22:45Check out our ray cast boxes, noting the erroneously placed box, and the fact that our light probes are considered colliders

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1:22:45Check out our ray cast boxes, noting the erroneously placed box, and the fact that our light probes are considered colliders

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1:23:41Prevent light probes from being considered colliders, introducing PushOccluder() to perform the occlusion code from PushCube()

1:29:01Check out our ray cast boxes, to see that our bad case has disappeared

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1:29:01Check out our ray cast boxes, to see that our bad case has disappeared

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1:29:01Check out our ray cast boxes, to see that our bad case has disappeared

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1:30:02Enable lighting in CompileZBiasProgram()

1:30:22See black

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1:30:22See black

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1:30:22See black

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1:30:57Make EndLightingComputation() draw a simple shadow if a light source is found to be occluded

1:31:24See different erroneous shadows

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1:31:24See different erroneous shadows

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1:31:24See different erroneous shadows

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1:32:28Make EndLightingComputation() draw all our rays

1:33:12See some black (non-hitting) rays that apparently should be hitting something

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1:33:12See some black (non-hitting) rays that apparently should be hitting something

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1:33:12See some black (non-hitting) rays that apparently should be hitting something

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1:34:07Disable lighting in CompileZBiasProgram()

1:34:44Try to pick a problem ray

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1:34:44Try to pick a problem ray

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1:34:44Try to pick a problem ray

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1:37:28Make EndLightingComputation() just draw a tick mark at the casting locations

1:39:09Check out our casting locations

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1:39:09Check out our casting locations

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1:39:09Check out our casting locations

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1:39:32Make EndLightingComputation() colour the tick marks cyan, and draw the rays themselves

1:40:14See some tick marks lacking a ray, and vice versa

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1:40:14See some tick marks lacking a ray, and vice versa

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1:40:14See some tick marks lacking a ray, and vice versa

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1:41:17Make EndLightingComputation() draw the direction in which each ray is pointing

1:42:15Again see some tick marks lacking a ray, and vice versa

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1:42:15Again see some tick marks lacking a ray, and vice versa

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1:42:15Again see some tick marks lacking a ray, and vice versa

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1:42:58Wonder what could be wrong with our rays

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1:42:58Wonder what could be wrong with our rays

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1:42:58Wonder what could be wrong with our rays

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1:43:54Pick a problem ray to isolate

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1:43:54Pick a problem ray to isolate

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1:43:54Pick a problem ray to isolate

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1:44:47Try to isolate our problem ray in EndLightingComputation()

1:44:57See that we picked our desired problem ray

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1:44:57See that we picked our desired problem ray

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1:44:57See that we picked our desired problem ray

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1:46:07Break on our BreakMePlease in EndLightingComputation(), and inspect our Cast to see that FLT_MAX may be causing the problem

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1:46:07Break on our BreakMePlease in EndLightingComputation(), and inspect our Cast to see that FLT_MAX may be causing the problem

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1:46:07Break on our BreakMePlease in EndLightingComputation(), and inspect our Cast to see that FLT_MAX may be causing the problem

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1:47:02Change EndLightingComputation() to set the CastP of non-hit rays to the light distance

1:48:53See that our problem ray's check mark is now accompanied by its actual ray, and that it remains a problem ray

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1:48:53See that our problem ray's check mark is now accompanied by its actual ray, and that it remains a problem ray

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1:48:53See that our problem ray's check mark is now accompanied by its actual ray, and that it remains a problem ray

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1:49:22Make EndLightingComputation() pass IsTestCast to RayCast()

1:49:30See that our RayCast() failed to test the child boxes through which our ray passes

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1:49:30See that our RayCast() failed to test the child boxes through which our ray passes

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1:49:30See that our RayCast() failed to test the child boxes through which our ray passes

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1:50:12Make RayCast() push all the child boxes into the system

1:50:42See that we do correctly detect the intersection

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1:50:42See that we do correctly detect the intersection

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1:50:42See that we do correctly detect the intersection

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1:51:33Prevent RayCast() from checking from AnyCloser before pushing on a box

1:52:17See that we do not detect the intersection

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1:52:17See that we do not detect the intersection

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1:52:17See that we do not detect the intersection

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1:52:27Prevent RayCast() from checking from AnyCloseEnough before pushing on a box

1:53:02See that we do not detect the intersection

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1:53:02See that we do not detect the intersection

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1:53:02See that we do not detect the intersection

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1:53:09Scrutinise the AnyInside value in RayCast()

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1:53:09Scrutinise the AnyInside value in RayCast()

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1:53:09Scrutinise the AnyInside value in RayCast()

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1:55:34Let RayCast() push on a box if AnyInside or AnyCloser

1:56:14See that we do not detect the intersection

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1:56:14See that we do not detect the intersection

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1:56:14See that we do not detect the intersection

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1:56:44Make RayCast() extend tInside to encompass FLT_MAX

1:57:08See that we do correctly detect the intersection

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1:57:08See that we do correctly detect the intersection

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1:57:08See that we do correctly detect the intersection

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1:57:23Restore our full checks in EndLightingComputation() before pushing a box

1:57:40Look at our correct ray

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1:57:40Look at our correct ray

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1:57:40Look at our correct ray

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1:57:49Make EndLightingComputation() draw all our rays, without boxes

1:58:23Find that our rays look a little more sane

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1:58:23Find that our rays look a little more sane

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1:58:23Find that our rays look a little more sane

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1:59:16Disable the test drawing in EndLightingComputation(), and enable lighting in CompileZBiasProgram()

2:00:22See our shadows, and determine to cast rays from light probe points

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2:00:22See our shadows, and determine to cast rays from light probe points

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2:00:22See our shadows, and determine to cast rays from light probe points

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2:01:20Make EndLightingComputation() draw all our rays

2:01:37Admire our rays in the lit scene

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2:01:37Admire our rays in the lit scene

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2:01:37Admire our rays in the lit scene

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2:02:31Q&A

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2:02:31Q&A

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2:02:31Q&A

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2:03:48eerrman1 Q: Where did you learn programming, like this lighting stuff, previously?

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2:03:48eerrman1 Q: Where did you learn programming, like this lighting stuff, previously?

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2:03:48eerrman1 Q: Where did you learn programming, like this lighting stuff, previously?

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2:06:53smack_ssbm Q: Which parts of the CRT do you think are the most poorly designed or unnecessary? What do you feel is missing?

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2:06:53smack_ssbm Q: Which parts of the CRT do you think are the most poorly designed or unnecessary? What do you feel is missing?

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2:06:53smack_ssbm Q: Which parts of the CRT do you think are the most poorly designed or unnecessary? What do you feel is missing?

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2:09:15euphius Q: Did you learn new things about game programming while working on Handmade Hero? If yes, what?

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2:09:15euphius Q: Did you learn new things about game programming while working on Handmade Hero? If yes, what?

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2:09:15euphius Q: Did you learn new things about game programming while working on Handmade Hero? If yes, what?

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2:10:36ablindorphan Q: Can you imagine any debug tools that would make stuff like graphics programming and lighting easier to debug (especially for beginners)?

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2:10:36ablindorphan Q: Can you imagine any debug tools that would make stuff like graphics programming and lighting easier to debug (especially for beginners)?

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2:10:36ablindorphan Q: Can you imagine any debug tools that would make stuff like graphics programming and lighting easier to debug (especially for beginners)?

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2:15:35bulmanator Q: Is it possible to get cl.exe and msbuild without installing Visual Studio?

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2:15:35bulmanator Q: Is it possible to get cl.exe and msbuild without installing Visual Studio?

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2:15:35bulmanator Q: Is it possible to get cl.exe and msbuild without installing Visual Studio?

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2:16:07enemypanda Q: How do you split your time between learning theory and practice?

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2:16:07enemypanda Q: How do you split your time between learning theory and practice?

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2:16:07enemypanda Q: How do you split your time between learning theory and practice?

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2:16:37erik_ava Q: How many hours did you expect Handmade Hero was going to be at the start?

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2:16:37erik_ava Q: How many hours did you expect Handmade Hero was going to be at the start?

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2:16:37erik_ava Q: How many hours did you expect Handmade Hero was going to be at the start?

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2:18:30mariaberry Q: Are you planning to do another series after you're done with Handmade Hero?

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2:18:30mariaberry Q: Are you planning to do another series after you're done with Handmade Hero?

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2:18:30mariaberry Q: Are you planning to do another series after you're done with Handmade Hero?

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2:18:34enemypanda Q: Any plans for physics?

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2:18:34enemypanda Q: Any plans for physics?

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2:18:34enemypanda Q: Any plans for physics?

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2:18:49Wrap it up

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2:18:49Wrap it up

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2:18:49Wrap it up

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