Solving for Debug Camera Parameters — Handmade Hero — Episode Guide

0:00Recap and set the stage for the day

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0:00Recap and set the stage for the day

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0:00Recap and set the stage for the day

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2:34Demo our world level / elevation fogging, and our need for a rigorous Z-bias solution

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2:34Demo our world level / elevation fogging, and our need for a rigorous Z-bias solution

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2:34Demo our world level / elevation fogging, and our need for a rigorous Z-bias solution

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5:52Z Occlusion

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5:52Z Occlusion

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5:52Z Occlusion

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10:07Keeping Z, sliding forward in Y and tilting backwards

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10:07Keeping Z, sliding forward in Y and tilting backwards

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10:07Keeping Z, sliding forward in Y and tilting backwards

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13:06Set up to get our debug camera in good shape to develop our Z occlusion solution

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13:06Set up to get our debug camera in good shape to develop our Z occlusion solution

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13:06Set up to get our debug camera in good shape to develop our Z occlusion solution

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14:44Demo the garbage debug camera

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14:44Demo the garbage debug camera

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14:44Demo the garbage debug camera

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15:57Show off the title screen

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15:57Show off the title screen

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15:57Show off the title screen

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16:29Reacquaint ourselves with the debug camera code in UpdateAndRenderWorld()

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16:29Reacquaint ourselves with the debug camera code in UpdateAndRenderWorld()

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16:29Reacquaint ourselves with the debug camera code in UpdateAndRenderWorld()

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19:17Set up UpdateAndRenderWorld() to handle debug camera panning, and more clearly set the Debug and Regular clip planes

21:24Continue to reacquaint ourselves with the debug camera code in UpdateAndRenderWorld()

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21:24Continue to reacquaint ourselves with the debug camera code in UpdateAndRenderWorld()

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21:24Continue to reacquaint ourselves with the debug camera code in UpdateAndRenderWorld()

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23:47Temporarily make PlayWorld() set the DebugCameraDolly

24:47Find that the debug camera is now restored

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24:47Find that the debug camera is now restored

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24:47Find that the debug camera is now restored

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25:03Set up UpdateAndRenderWorld() to position the debug camera to match the regular camera

29:52Reconstructing a camera's dolly, orbit and pitch from a point¹

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29:52Reconstructing a camera's dolly, orbit and pitch from a point¹

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29:52Reconstructing a camera's dolly, orbit and pitch from a point¹

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37:14Make UpdateAndRenderWorld() reconstruct the debug camera's dolly from the regular camera's position

41:33Using the inner product to isolate the position of a point on only one axis

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41:33Using the inner product to isolate the position of a point on only one axis

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41:33Using the inner product to isolate the position of a point on only one axis

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42:49Add CameraPan to game_mode_world for UpdateAndRenderWorld() to compute

45:16Make UpdateAndRenderWorld() reconstruct the debug camera's orbit and pitch using ATan2()

47:20atan2 assumes that our starting vector points along x

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47:20atan2 assumes that our starting vector points along x

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47:20atan2 assumes that our starting vector points along x

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49:57Change UpdateAndRenderWorld() to feed an x-pointing vector to atan2

52:37Crash in FindAlign() with an "Access violation" error

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52:37Crash in FindAlign() with an "Access violation" error

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52:37Crash in FindAlign() with an "Access violation" error

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53:44Find that the debug camera is wrong

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53:44Find that the debug camera is wrong

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53:44Find that the debug camera is wrong

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54:03Scrutinise our debug camera construction in UpdateAndRenderWorld()

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54:03Scrutinise our debug camera construction in UpdateAndRenderWorld()

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54:03Scrutinise our debug camera construction in UpdateAndRenderWorld()

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57:15Make UpdateAndRenderWorld() compute separate debug camera values to aid debugging

59:11Step in to UpdateAndRenderWorld() and inspect our debug camera values

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59:11Step in to UpdateAndRenderWorld() and inspect our debug camera values

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59:11Step in to UpdateAndRenderWorld() and inspect our debug camera values

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1:05:46Fix the winding of the DebugCameraPitch computation in UpdateAndRenderWorld()

1:09:40Step back in to UpdateAndRenderWorld() and inspect our DebugCameraPitch

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1:09:40Step back in to UpdateAndRenderWorld() and inspect our DebugCameraPitch

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1:09:40Step back in to UpdateAndRenderWorld() and inspect our DebugCameraPitch

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1:10:20Fix the DebugCamera0 computation to use an XRotation(), and negate the PlanarArm length in the DebugCameraPitch computation

1:11:08Step back in to UpdateAndRenderWorld() and inspect our DebugCameraPitch

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1:11:08Step back in to UpdateAndRenderWorld() and inspect our DebugCameraPitch

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1:11:08Step back in to UpdateAndRenderWorld() and inspect our DebugCameraPitch

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1:12:11Refrain from negating the PlanarArm length in the DebugCameraPitch computation

1:12:23Step back in to UpdateAndRenderWorld() and inspect our DebugCameraPitch

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1:12:23Step back in to UpdateAndRenderWorld() and inspect our DebugCameraPitch

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1:12:23Step back in to UpdateAndRenderWorld() and inspect our DebugCameraPitch

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1:12:58Find that our orbit is −90° off

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1:12:58Find that our orbit is −90° off

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1:12:58Find that our orbit is −90° off

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1:13:14Fix the DebugCameraOrbit computation

1:14:32Find that our debug camera is now correct

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1:14:32Find that our debug camera is now correct

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1:14:32Find that our debug camera is now correct

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1:15:28Invert the mouse's X-axis in UpdateAndRenderWorld()

1:15:47Try out our perfect debug camera

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1:15:47Try out our perfect debug camera

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1:15:47Try out our perfect debug camera

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1:16:28Naively make UpdateAndRenderWorld() to handle debug camera panning

1:17:26Try our newly panning debug camera

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1:17:26Try our newly panning debug camera

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1:17:26Try our newly panning debug camera

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1:17:46Invert the panning axes in UpdateAndRenderWorld()

1:17:59Try our newly panning debug camera, noting that it breaks when the orbits of our debug and regular cameras are not aligned

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1:17:59Try our newly panning debug camera, noting that it breaks when the orbits of our debug and regular cameras are not aligned

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1:17:59Try our newly panning debug camera, noting that it breaks when the orbits of our debug and regular cameras are not aligned

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1:18:46Enable UpdateAndRenderWorld() to pan the camera in camera-space

1:20:45Show our camera panning in camera-space

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1:20:45Show our camera panning in camera-space

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1:20:45Show our camera panning in camera-space

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1:21:13Find that we are inverting the mouse's Y axis

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1:21:13Find that we are inverting the mouse's Y axis

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1:21:13Find that we are inverting the mouse's Y axis

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1:22:17Note the correctness of our panning

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1:22:17Note the correctness of our panning

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1:22:17Note the correctness of our panning

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1:22:45Make UpdateAndRenderWorld() invert our panning and scale its speed by the camera's distance from the subject

1:23:40Try out our distance-proportional panning camera

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1:23:40Try out our distance-proportional panning camera

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1:23:40Try out our distance-proportional panning camera

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1:25:28Take a close look at our sprites in preparation to try our Z occlusion solution

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1:25:28Take a close look at our sprites in preparation to try our Z occlusion solution

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1:25:28Take a close look at our sprites in preparation to try our Z occlusion solution

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1:27:59Reacquaint ourselves with SpriteValuesForUpright()

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1:27:59Reacquaint ourselves with SpriteValuesForUpright()

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1:27:59Reacquaint ourselves with SpriteValuesForUpright()

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1:30:21Remove ZBias from SpriteValuesForUpright()

1:30:32Find that we draw just fine without the ZBias

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1:30:32Find that we draw just fine without the ZBias

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1:30:32Find that we draw just fine without the ZBias

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1:30:44Temporarily make SpriteValuesForUpright() displace the sprites in Y

1:32:33Check out our displaced entities and adjust the alignment points to find that we are displacing in the wrong direction

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1:32:33Check out our displaced entities and adjust the alignment points to find that we are displacing in the wrong direction

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1:32:33Check out our displaced entities and adjust the alignment points to find that we are displacing in the wrong direction

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1:33:17Change SpriteValuesForUpright() to use the (not inverted) WorldDim.y in the sprite displacement

1:33:44Align the hero's body and head, and find that we now sort beautifully (i.e. no penetration with walls), except during hopping which we are erroneously performing in Y

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1:33:44Align the hero's body and head, and find that we now sort beautifully (i.e. no penetration with walls), except during hopping which we are erroneously performing in Y

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1:33:44Align the hero's body and head, and find that we now sort beautifully (i.e. no penetration with walls), except during hopping which we are erroneously performing in Y

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1:37:25Make UpdateAndRenderEntities() hop the entities in Z

1:39:07Check out our Z-hopping entities, to find that our hero never penetrates walls

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1:39:07Check out our Z-hopping entities, to find that our hero never penetrates walls

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1:39:07Check out our Z-hopping entities, to find that our hero never penetrates walls

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1:40:26Q&A

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1:40:26Q&A

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1:40:26Q&A

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1:41:35Brian Q: You uploaded the last episode as episode 520, instead of 519

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1:41:35Brian Q: You uploaded the last episode as episode 520, instead of 519

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1:41:35Brian Q: You uploaded the last episode as episode 520, instead of 519

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1:42:17recyrillic Q: Are we gonna switch to remedybg for Handmade Hero soon?

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1:42:17recyrillic Q: Are we gonna switch to remedybg for Handmade Hero soon?

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1:42:17recyrillic Q: Are we gonna switch to remedybg for Handmade Hero soon?

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1:43:41garryjohanson Q: So one of the reasons I became briefly enthusiastic about WinDBG Preview is the ability to record a trace of a running program and then send that trace to someone else and they can look at the exact debug session you were looking at, rather than having to reproduce a bug spending possibly a long period of time. To me that sounds like a silver bullet way to reproduce a bug. Can you think of any reason why I would be wrong to conclude that the feature is a silver bullet for reproducing bugs?

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1:43:41garryjohanson Q: So one of the reasons I became briefly enthusiastic about WinDBG Preview is the ability to record a trace of a running program and then send that trace to someone else and they can look at the exact debug session you were looking at, rather than having to reproduce a bug spending possibly a long period of time. To me that sounds like a silver bullet way to reproduce a bug. Can you think of any reason why I would be wrong to conclude that the feature is a silver bullet for reproducing bugs?

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1:43:41garryjohanson Q: So one of the reasons I became briefly enthusiastic about WinDBG Preview is the ability to record a trace of a running program and then send that trace to someone else and they can look at the exact debug session you were looking at, rather than having to reproduce a bug spending possibly a long period of time. To me that sounds like a silver bullet way to reproduce a bug. Can you think of any reason why I would be wrong to conclude that the feature is a silver bullet for reproducing bugs?

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1:46:27ingenero Q: So far it seems all the animation is done programatically, moving static sprites. Is there any plan to include pre-set or artist-created animations?

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1:46:27ingenero Q: So far it seems all the animation is done programatically, moving static sprites. Is there any plan to include pre-set or artist-created animations?

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1:46:27ingenero Q: So far it seems all the animation is done programatically, moving static sprites. Is there any plan to include pre-set or artist-created animations?

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1:47:30pythno Q: I studied the rendering code for a bit and it seems that the vertices and indices for the cubes (and quads) are generated each frame on the CPU and put into a big VBO which is set to stream_draw. Is this correct and, if yes, what was the decision to do it that way and not even using VAOs? For big models with a lot of polygons would you go a different route?

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1:47:30pythno Q: I studied the rendering code for a bit and it seems that the vertices and indices for the cubes (and quads) are generated each frame on the CPU and put into a big VBO which is set to stream_draw. Is this correct and, if yes, what was the decision to do it that way and not even using VAOs? For big models with a lot of polygons would you go a different route?

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1:47:30pythno Q: I studied the rendering code for a bit and it seems that the vertices and indices for the cubes (and quads) are generated each frame on the CPU and put into a big VBO which is set to stream_draw. Is this correct and, if yes, what was the decision to do it that way and not even using VAOs? For big models with a lot of polygons would you go a different route?

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1:49:31vapenir Q: What's your take on profilers vs. DIY in-game profiling? What are some decent profilers that you know of or have used?

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1:49:31vapenir Q: What's your take on profilers vs. DIY in-game profiling? What are some decent profilers that you know of or have used?

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1:49:31vapenir Q: What's your take on profilers vs. DIY in-game profiling? What are some decent profilers that you know of or have used?

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1:51:05pkey1 Q: What you think about python?

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1:51:05pkey1 Q: What you think about python?

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1:51:05pkey1 Q: What you think about python?

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1:52:16lucid_frost Q: Do you think there is any value in keeping the concept of registers in the higher level language?

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1:52:16lucid_frost Q: Do you think there is any value in keeping the concept of registers in the higher level language?

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1:52:16lucid_frost Q: Do you think there is any value in keeping the concept of registers in the higher level language?

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1:52:39friedhit Q: How do you feel about dynamically-typed languages?

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1:52:39friedhit Q: How do you feel about dynamically-typed languages?

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1:52:39friedhit Q: How do you feel about dynamically-typed languages?

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1:53:08useless_pony Q: I may have asked this before, but have you looked at ponylang? If so, what are your thoughts on it?

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1:53:08useless_pony Q: I may have asked this before, but have you looked at ponylang? If so, what are your thoughts on it?

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1:53:08useless_pony Q: I may have asked this before, but have you looked at ponylang? If so, what are your thoughts on it?

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1:53:46vapenir Q: Does the game load levels from files, and do you plan to include a level editor with the final game?

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1:53:46vapenir Q: Does the game load levels from files, and do you plan to include a level editor with the final game?

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1:53:46vapenir Q: Does the game load levels from files, and do you plan to include a level editor with the final game?

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1:55:20Deep thoughts on modern languages like PLISK, StopLang and ZnO, and their cutting edge provision for memory composting

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1:55:20Deep thoughts on modern languages like PLISK, StopLang and ZnO, and their cutting edge provision for memory composting

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1:55:20Deep thoughts on modern languages like PLISK, StopLang and ZnO, and their cutting edge provision for memory composting

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2:01:34Wrap it up for the day

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2:01:34Wrap it up for the day

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2:01:34Wrap it up for the day

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