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Code Issues 150 Wiki Activity

Cast shadows of the cab lamp from the cab in the GL 4.6 renderer

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Hirek
2026-10-16 02:43:27 +02:00
parent 4d3a401aae
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15 changed files with 568 additions and 8 deletions
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docs/opengl46-renderer.md
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@@ -116,8 +116,22 @@ scales can also be changed in the **Light clusters** debug window.
which bounces around the cab (`gfx.lights.cab.bounce`), and the sun shadows stay.
The lamps of models and compartments fade in from the light level at which scenery lamps switch on (`ls_Dark`) to full
darkness; in daylight they are not gathered at all. None of these lights casts shadows yet, so they also light what is
behind walls within their reach; that reach is kept short for compartments and the cab.
darkness; in daylight they are not gathered at all. Of these lights only the cab lamp casts shadows (see below); the others
also light what is behind walls within their reach, which is kept short for compartments.
**Shadows of the cab lamp** (`gfx.lights.shadows`): the cab casts shadows in the light of its lamp, the desk, the seats,
the levers and the walls (light leaves the cab only through the windows, glass doesn't stop it). They come from a cube
shadow map around the lamp, drawn with the opaque parts of the cab model only. The map is kept in the space of the cab, so
it stays right as the vehicle moves; it is drawn anew every few frames, for the moving parts of the cab, and at once when
the lamp turns on or the cab changes. All six faces are drawn in one go, so drawing it costs about as much as drawing the
cab once more. Nothing is drawn with the lamp off (in the daylight it is). The level:
| Level | Map | Drawn | Edges |
|---|---|---|---|
| `no` (0) | none | never | lamp without shadows, as before |
| `low` (1) | 512 x 512 per face, 6 MB | every 4th frame | hard (2x2 filter) |
| `medium` (2, default) | 1024 x 1024 per face, 24 MB | every 2nd frame | soft, 4 samples |
| `high` (3) | 1024 x 1024 per face, 24 MB | every frame | softer, 8 samples |
| Entry | Default | Meaning |
|---|---|---|
@@ -129,6 +143,7 @@ behind walls within their reach; that reach is kept short for compartments and t
| `gfx.lights.cab.intensity` | `1.5` | brightness of the cab lamp |
| `gfx.lights.cab.bounce` | `0.3` | 0..1: share of the former ambient light of the cab lamp kept with the lamp on |
| `gfx.lights.range` | `300` | distance from the camera the lamps of models and vehicles are gathered from, metres |
| `gfx.lights.shadows` | `medium` | `no`/`low`/`medium`/`high` (or 0..3): shadows of the cab lamp, see above |
### Changed option
@@ -165,7 +180,9 @@ editor goes through the first `dynamiclights` headlights, the reflections throug
windows): the switch for clustered lights, the heat map, the grid state and the same counters, and the switches and
scales of the lamps with their counts. Shift+F12 shows the lamps in the `local lights:` row: how many were gathered (from
scenery models, vehicles and compartments, and the cab lamp), how many were placed in the light buffer of the main view
(those that may light something in view) and did not fit, and the cpu time of gathering them.
(those that may light something in view) and did not fit, and the cpu time of gathering them. The `lamp shadows:` row
gives the size of the cube map, whether it holds the cab lamp, the draw calls and cpu time of its last drawing, and the
timings the GPU time of drawing it (`lamp shadows:`); the level can be changed in the window.
- **Sky and exposure** window (next to the Light clusters window): the switches and scales above, the share of the
atmosphere, the colours of the sun, ambient light and fog in use, and the measured luminance and exposure.
Shift+F12 shows the GPU time of `atmosphere:` (look-up tables, only when the sun moved or the weather changed),