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feat: one depth projection for the street - #3
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What stood where in a side-view scene was worked out apart in each place: the rain had its own perspective (1 / (1 - 0.6 depth)) and its own landing line with pixel insets, the water its own, and a game laying things out in depth (Umbrella's 2.5D road) a third. Ground now holds the one projection everything shares. Everything stands at a depth - below 0 behind the street line, 0 on it, 0..1 on the ground towards the eye - and from it follow how far it is (distanceAt: rows are equal steps of 1 / distance, crowding towards the line), where it meets the ground (yAt, depthAt), how big and how fast it slides by (scaleAt, projectX) and the angle the eye looks down at it (sinElevation, now from the same distances). Tests: the projection's places, sizes, parallax and crowding.
The rain and the water now take the world's projection (Ground) instead of their own: a drop lands where its depth meets the ground (yAt) and crosses the view as fast as that depth makes it (scaleAt); water catches it there. Without a ground the old perspective stays. The rain's margins past the view are a metre, not 40 world units, so it works in metres as in pixels. Reflectable.groundDepth: something standing at a depth is mirrored about where that depth meets the ground, without working out its base itself. Tests: a block at a depth is mirrored about its spot on the ground.
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Stacked on #1 (
feat/wet-world).First step of one depth model for side-view scenes. Things in the scene used to work out where they stand, how big they are and how fast they move each in their own way. Now they all take this from one projection on the
Ground.Ground projection
Everything stands at a depth. The scale runs from below 0 (behind the street line), through 0 (on the line), to 0..1 (on the ground towards the eye). From the depth:
distanceAt: rows are equal steps of 1/distance, as in perspective, so they crowd towards the street line.yAt/depthAt: where the thing meets the ground on screen.scaleAt/projectX: how big it is and how fast it slides by (parallax).sinElevation: the angle the eye looks down. It is now computed from the same distances, so Fresnel follows them too.Rain and water on it
Rainlands a drop atyAt(depth)and moves it atscaleAt(depth).WaterSurfacecatches drops where their depth meets the ground.Reflectable.groundDepth: something standing at a depth is mirrored about its spot on the ground.Tests
flame_lighting: 16 tests, including the projection's places, sizes, parallax and crowding.flame_water: 29 tests, including mirroring by depth.Next
Raingets what Umbrella's own rain has: a deflector (the swinging canopy), a wind field, and a cloud it falls from.