51 lines
2.3 KiB
Text
51 lines
2.3 KiB
Text
# ground.ludic - what the feet stand on, and the one rule for a step versus a slope
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# The ground at (x, z) for feet at from_y, a collider's top included when it is a step up. Only
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# the body's own movement asks this: the ground itself (CharacterGround.height) stays pure, or
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# the height ratchets on itself and the body ends up on things it never climbed.
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export function char_stand_at(x: float, z: float, from_y: float) -> float {
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let base = CharacterGround.height(x, z)
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return CharacterGround.top_at(x, z, 0.35, Math.max(from_y, base), CHAR_STEP, base)
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}
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# A step up and a slope up are different refusals. Within CHAR_STEP of the feet is a step, taken
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# whatever the gradient into it (a 45 cm deck arrives in one frame); above that the boots decide,
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# measured over CHAR_SLOPE_PROBE, so the frame rate never changes the answer.
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export function char_slope_blocks(character_st: CharacterState, nh: float, fx: float, fz: float) -> bool {
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if nh - character_st.chr_y > CHAR_STEP { return true }
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let sx = character_st.chr_x + fx * CHAR_SLOPE_PROBE
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let sz = character_st.chr_z + fz * CHAR_SLOPE_PROBE
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return CharacterGround.height(sx, sz) - character_st.chr_y > CHAR_SLOPE_PROBE * CharacterGround.slope_limit()
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}
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# a body of radius r at (x, z) from y0 to y1, out of every collider: the resolved point is chr_out_*
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function chr_push(character_st: mut CharacterState, x: float, z: float, r: float, y0: float, y1: float) -> bool {
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character_st.chr_ask_x = x
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character_st.chr_ask_z = z
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let hit = CharacterGround.push(x, z, r, y0, y1)
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character_st.chr_out_x = x
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character_st.chr_out_z = z
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if hit {
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character_st.chr_out_x = CharacterGround.pushed_x()
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character_st.chr_out_z = CharacterGround.pushed_z()
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}
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return hit
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}
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function chr_bed_depth(x: float, z: float) -> float { return CharacterGround.water(x, z) - CharacterGround.bed(x, z) }
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export function char_wrap(a: float) -> float {
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var d = a
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while d > chr_pi { d = d - 2.0 * chr_pi }
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while d < -chr_pi { d = d + 2.0 * chr_pi }
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return d
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}
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export function char_toward(cur: float, target: float, rate: float) -> float {
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return cur + Math.clamp(target - cur, -rate, rate)
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}
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# did the gait's phase step over `mark` this frame? (it wraps at 2 pi)
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function chr_cross(a: float, b: float, mark: float) -> bool {
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if b < a { return a > mark or b < mark }
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return a < mark and not (b < mark)
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}
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