Particles: Make attached particle spawners respect the parent's yaw

Position, velocity and acceleration vectors of particles are rotated
by the yaw of the parent object so that they are truly relative to it.
Clarify new attached particle spawner behavior in lua_api.txt.
master
orwell96 2016-10-24 19:56:27 +02:00 committed by paramat
parent 4a0a6723af
commit 681d127ff1
5 changed files with 37 additions and 10 deletions

View File

@ -4152,7 +4152,8 @@ The Biome API is still in an experimental phase and subject to change.
-- ^ collision_removal: if true then particle is removed when it collides,
-- ^ requires collisiondetection = true to have any effect
attached = ObjectRef,
-- ^ attached: if defined, makes particle positions relative to this object.
-- ^ attached: if defined, particle positions, velocities and accelerations
-- ^ are relative to this object's position and yaw.
vertical = false,
-- ^ vertical: if true faces player using y axis only
texture = "image.png",

View File

@ -61,6 +61,7 @@ public:
virtual bool getCollisionBox(aabb3f *toset){return false;}
virtual bool collideWithObjects(){return false;}
virtual v3f getPosition(){return v3f(0,0,0);}
virtual float getYaw() const {return 0;}
virtual scene::ISceneNode *getSceneNode(){return NULL;}
virtual scene::IMeshSceneNode *getMeshSceneNode(){return NULL;}
virtual scene::IAnimatedMeshSceneNode *getAnimatedMeshSceneNode(){return NULL;}

View File

@ -313,7 +313,8 @@ public:
{return &m_selection_box;}
v3f getPosition()
{return m_position;}
inline float getYaw() const
{return 0;}
std::string infoText()
{return m_infotext;}

View File

@ -136,6 +136,10 @@ public:
aabb3f *getSelectionBox();
v3f getPosition();
inline float getYaw() const
{
return m_yaw;
}
scene::ISceneNode *getSceneNode();

View File

@ -253,12 +253,17 @@ void ParticleSpawner::step(float dtime, ClientEnvironment* env)
m_time += dtime;
bool unloaded = false;
v3f attached_offset = v3f(0,0,0);
bool is_attached = false;
v3f attached_pos = v3f(0,0,0);
float attached_yaw = 0;
if (m_attached_id != 0) {
if (ClientActiveObject *attached = env->getActiveObject(m_attached_id))
attached_offset = attached->getPosition() / BS;
else
if (ClientActiveObject *attached = env->getActiveObject(m_attached_id)) {
attached_pos = attached->getPosition() / BS;
attached_yaw = attached->getYaw();
is_attached = true;
} else {
unloaded = true;
}
}
if (m_spawntime != 0) // Spawner exists for a predefined timespan
@ -277,8 +282,15 @@ void ParticleSpawner::step(float dtime, ClientEnvironment* env)
v3f pos = random_v3f(m_minpos, m_maxpos);
v3f vel = random_v3f(m_minvel, m_maxvel);
v3f acc = random_v3f(m_minacc, m_maxacc);
// Make relative to offest
pos += attached_offset;
if (is_attached) {
// Apply attachment yaw and position
pos.rotateXZBy(attached_yaw);
pos += attached_pos;
vel.rotateXZBy(attached_yaw);
acc.rotateXZBy(attached_yaw);
}
float exptime = rand()/(float)RAND_MAX
*(m_maxexptime-m_minexptime)
+m_minexptime;
@ -321,10 +333,18 @@ void ParticleSpawner::step(float dtime, ClientEnvironment* env)
{
if (rand()/(float)RAND_MAX < dtime)
{
v3f pos = random_v3f(m_minpos, m_maxpos)
+ attached_offset;
v3f pos = random_v3f(m_minpos, m_maxpos);
v3f vel = random_v3f(m_minvel, m_maxvel);
v3f acc = random_v3f(m_minacc, m_maxacc);
if (is_attached) {
// Apply attachment yaw and position
pos.rotateXZBy(attached_yaw);
pos += attached_pos;
vel.rotateXZBy(attached_yaw);
acc.rotateXZBy(attached_yaw);
}
float exptime = rand()/(float)RAND_MAX
*(m_maxexptime-m_minexptime)
+m_minexptime;