In the US version of Pilotwings 64, the gyrocopter's update routine func_8030399C clears a vector (unk31C) and has five routines add terms to it: func_80307A9C, func_80307E2C, func_80308478, func_80307BAC, and func_80307EA8. A routine chosen by state can add to it after them (func_80304B98, for states 1 and 4, does), and func_80309090 copies the result to unk1AC. In state 1 (unkC0), the routine adds unk1AC times the frame time to the craft's velocity (unk190), with no mass dividing it; in state 0 it first combines unk1AC with cross terms of the velocity and the turn rates (unk1B8). func_80307E2C adds (0, 0, −9.8), z being the world's vertical, turned into the craft's frame through the inverse of its matrix (by the atlas's reading, gravity). func_80307A9C adds, on each of the craft's axes, a curve of the square of unk364's component on that axis, signed like the component: 0 at 0, 4.2 at 2661.2188, and 7.56 at 6944.389 and above, linear between (by the atlas's reading, air resistance). Those squares are speeds of about 51.59 and 83.33 (computed). func_80308478 sets unk364 to the vector env_802E1754 returns for the craft's position, in the craft's frame, less the craft's velocity, and adds 0.21 of that vector as a term of its own; by the atlas's reading the vector is the air's velocity and unk364 the airspeed. Below a speed (unk1A8) of 51.587303 the vector is scaled by the square of the speed over 51.587303, and outside state 0 it's taken as zero. The other two routines are in pw64/gyrocopter-lift. | src/app/gyrocopter.c L251–279src/app/gyrocopter.c L349–365src/app/gyrocopter.c L280–310src/app/gyrocopter.c L1818–1837src/app/gyrocopter.c L566–623src/app/gyrocopter.c L1442–1452src/app/gyrocopter.c L122–125src/app/gyrocopter.c L1360–1380src/app/code_9A960.c L257–280src/app/gyrocopter.c L1563–1605src/app/gyrocopter.c L410src/app/code_7CF30.c L471 | Code |
In the US version of Pilotwings 64, two of the terms the gyrocopter's func_8030399C sums give it lift, by the atlas's reading. The one the atlas calls the rotor term (func_80307BAC) is 0.3 times the square of the airspeed's component on the z axis of the matrix unk25C, signed like that component and capped at 200 when positive, times the square of the airspeed's y component over 25, held between 0.05 and 1; it's added along the z axis of the matrix unk21C. The one it calls the engine term (func_80307EA8), while usingFuel is set, is 35 × power (unkB4) × a factor of height (spD8, the atlas's altitude factor), split 0.24 onto y and 0.76 onto z, the z part also times a curve of the negated y airspeed: 0 at 0, 0.15 at 10, 0.4 at 20, 1.2 at 50, and 1.5 at 100 and above. It too goes through unk21C, and its y component is cut to 0.9 when unk1F0 is nonzero, unk190.y is positive, and unk7C is 0. That factor is 1 up to a height of 700 and falls by 0.01 per unit above it, held at 0 from 800 up; that hold is under #if !defined(VERSION_JP), so a Japanese build lets the factor go negative. Neither term applies while unkC1 is set or in state 2 (unkC0). | src/app/gyrocopter.c L1382–1440src/app/gyrocopter.c L1454–1463src/app/gyrocopter.c L1490–1516src/app/gyrocopter.c L74–79src/app/code_7CF30.c L470–474 | Code |
In the US version of Pilotwings 64, the gyrocopter's fuel is a number from 0 to 1, starting at the value the task's first start pad holds, or 0 if the task has no start pad (db_getstart). While usingFuel is set, func_80307EA8 takes off each update the frame time times a rate read from a curve of the power (unkB4, the throttle that A raises and B lowers, which the HUD shows as power; in the throttle's case 0 A sets usingFuel, and in cases 1 and 2 A sets it only with fuel above 0): 0.001 at 0, 0.002 at 0.5, and 0.005 at full, linear between. The frame time (D_8034F854) is the time since the last frame held between 0.01 and 0.1, so the rate is per second, and a full tank lasts 200 s at full power and 1,000 s at none (computed). At 0 it clears usingFuel. In a Class B task, each update that func_802E08F4 returns nonzero for the craft's position sets the fuel to 1, and SFX_UI_FUEL_ADDED plays on the first. func_80307EA8 does none of this, refill or drain, while unkC1 is set or in state 2 (unkC0). Separately, the HUD update in code_7CF30.c warns below 0.15 (TEXT_FUEL_WAR) and at 0 (TEXT_FUEL_OUT). | src/app/gyrocopter.c L84–88src/app/gyrocopter.c L1454–1488src/app/code_9A960.c L257–280src/app/code_9A960.c L9src/app/code_9A960.c L210–220src/app/code_7CF30.c L95src/app/code_66F70.c L260–294src/app/code_7CF30.c L248–309src/app/code_7CF30.c L473–474src/app/code_7CF30.c L494–499 | Code |
In the US version of Pilotwings 64, a thermal is a vertical cylinder from the task's data (TaskTHER): a base position, a radius (scale), and a height. therm_80346C08 sums a vector from each thermal whose cylinder holds the point (by the atlas's reading, its air velocity): its horizontal distance d from the axis at most the radius r, and its height z above the base between 0 and the thermal's height. In therm_80346E04 the vector's vertical part (the atlas's updraft) is the thermal's unk24 × √((r − d)/r), full on the axis and 0 at the edge. Beyond 1 unit from the axis its horizontal part is at right angles to the axis direction, of length unk20 × (1 − 2|r/2 − d|/r) × d, longest halfway out (the atlas's swirl). Both fade in from 0 at the base to full at height unk18, and from unk1C fade out to 0 at the top. env_802E1754 adds the sum to the vector wind_8034D550 gives for the point (by the atlas's reading, the wind), along with, unless the task's unk8 is set, a further wind and a push from beyond 2050 units outside the map's bounds. The hang glider (hangGlider_802F391C) multiplies the total by its pilot's unk2F8: 1.2 for Lark and Kiwi, 1.0 for Goose and Ibis, and 0.8 for Hawk and Robin. | src/app/task.h L274–283src/app/thermals.c L156–199src/app/thermals.c L201–235src/app/environment.c L338–382src/app/hang_glider2.c L574–591src/app/hang_glider1.c L519–569src/app/hang_glider1.c L572–618src/app/hang_glider1.c L623–669src/app/hang_glider1.c L674–722src/app/hang_glider1.c L725–771src/app/hang_glider1.c L776–822 | Code |
In the US version of Pilotwings 64, the thermals switch off in one test: the hang glider's test with index 0 in the Pilot class (cls 3, CLASS_PILOT). There, from 240 on the clock D_8034F850 (by the decompilers' comment, the current time; the test's setup, gameUpdateStateTestSetup, sets it to 0, and each time func_80313D74 runs it adds the time since the last frame held between 0.01 and 0.1, so it counts seconds of game time), therm_8034695C narrows the drawn cylinders to nothing over the next 10, and at 250 (THERM_DISABLE_TIME) removes the thermals and shows TEXT_THERM_OFF. The narrowing scales only the model's matrix: the updraft reads the task's radius until the thermals are gone. | src/app/thermals.c L14–18src/app/thermals.c L98–101src/app/task.h L53–56src/app/thermals.c L114–140src/app/thermals.c L182–184src/app/code_9A960.c L8src/app/code_9A960.c L210–221src/app/game.c L431–545src/app/code_9A960.c L225–227 | Code |