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feat(gameengine): floaty low-grav jumps for fun-feel q3 movement

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Replace held-jump-extends-height (Mario-style) with a Q3-style impulse
jump: set vel.y once on press, gravity does the rest. Apply per-player
gravity scaling symmetrically in air (rising and falling) so jumps don't
feel floaty going up but heavy coming down.

Tune q3_frame for a fun, floaty feel rather than authentic Q3 numbers:
gravity_scale 0.55 (≈55% Earth) + jump_velocity 5.5 → ~2.8m apex,
~2s airtime. Trades rocket-dodge utility for hang-time enjoyment.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
johndoe6345789
2026-04-30 15:21:28 +01:00
parent a52ffd4ba9
commit c53f39601d
2 changed files with 18 additions and 35 deletions
Download Patch File Download Diff File Expand all files Collapse all files
gameengine/packages/quake3/workflows/q3_frame.json
+3 -4
View File
@@ -17,10 +17,9 @@
"move_speed": 4.5,
"sprint_multiplier": 1.5,
"crouch_multiplier": 0.45,
"jump_height": 0.9,
"jump_duration": 0.22,
"air_control": 0.15,
"gravity_scale": 1.6,
"jump_velocity": 5.5,
"air_control": 0.25,
"gravity_scale": 0.55,
"ground_accel": 30.0,
"ground_friction": 24.0,
"crouch_height": 0.5,
gameengine/src/services/impl/workflow/workflow_generic_steps/workflow_physics_fps_move_step.cpp
+15 -31
View File
@@ -37,7 +37,6 @@ void WorkflowPhysicsFpsMoveStep::Execute(
const float moveSpeed = getNum("move_speed", 6.0f);
const float sprintMultiplier = getNum("sprint_multiplier", 1.8f);
const float crouchMultiplier = getNum("crouch_multiplier", 0.4f);
const float jumpForce = getNum("jump_force", 5.0f);
const float crouchHeight = getNum("crouch_height", 0.8f);
const float standHeight = getNum("stand_height", 1.6f);
const float airControl = getNum("air_control", 0.3f);
@@ -138,43 +137,28 @@ void WorkflowPhysicsFpsMoveStep::Execute(
float newX = curX + (moveX - curX) * airControl;
float newZ = curZ + (moveZ - curZ) * airControl;
body->setLinearVelocity(btVector3(newX, currentVel.y(), newZ));
// Extra downward gravity for snappy Quake-style landing
if (currentVel.y() < 0.0f) {
body->applyCentralForce(btVector3(0, -9.81f * body->getMass() * (gravityScale - 1.0f), 0));
}
}
// Jump - hold space for higher jump, release early for short hop
// Per-player gravity scaling (applies symmetrically in air, both rising
// and falling). gravityScale > 1.0 = heavier; < 1.0 = floatier; 1.0 =
// Earth. Implemented as an additive force on top of the world's -9.81
// so the rest of the world keeps Earth gravity untouched.
if (!grounded && gravityScale != 1.0f) {
body->applyCentralForce(btVector3(0, -9.81f * body->getMass() * (gravityScale - 1.0f), 0));
}
// Quake-style impulse jump: set upward velocity once on press while
// grounded; height is determined by gravity from there. No hold-to-extend.
// The latching `player_jumping` flag prevents auto-bunnyhop from a held key.
const float jumpVelocity = getNum("jump_velocity", 6.5f);
bool wasJumping = context.GetBool("player_jumping", false);
float jumpTime = context.Get<float>("player_jump_time", 0.0f);
float jumpDuration = getNum("jump_duration", 1.2f);
float jumpHeight = getNum("jump_height", 3.5f);
if (keySpace && !keyCtrl && grounded && !wasJumping) {
btVector3 vel = body->getLinearVelocity();
body->setLinearVelocity(btVector3(vel.x(), jumpVelocity, vel.z()));
context.Set<bool>("player_jumping", true);
context.Set<float>("player_jump_time", 0.0f);
jumpTime = 0.0f;
}
if (context.GetBool("player_jumping", false)) {
float dt = 1.0f / 60.0f;
jumpTime += dt;
context.Set<float>("player_jump_time", jumpTime);
// Keep rising while space is held and under max duration
if (keySpace && jumpTime < jumpDuration) {
float t = jumpTime / jumpDuration;
float upSpeed = (jumpHeight / jumpDuration) * (1.0f - t * t);
btVector3 vel = body->getLinearVelocity();
body->setLinearVelocity(btVector3(vel.x(), upSpeed, vel.z()));
} else {
// Released space or hit max duration - start falling
context.Set<bool>("player_jumping", false);
}
}
if (grounded && !keySpace) {
if (!keySpace && grounded) {
context.Set<bool>("player_jumping", false);
}