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Fix and improve particle(spawner) documentation (#14804)
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@ -10711,6 +10711,11 @@ Used by `minetest.add_particle`.
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drag = {x=0, y=0, z=0},
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-- v5.6.0 and later: Optional drag value, consult the following section
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-- Note: Only a vector is supported here. Alternative forms like a single
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-- number are not supported.
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jitter = {min = ..., max = ..., bias = 0},
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-- v5.6.0 and later: Optional jitter range, consult the following section
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bounce = {min = ..., max = ..., bias = 0},
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-- v5.6.0 and later: Optional bounce range, consult the following section
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@ -10736,7 +10741,10 @@ will be ignored.
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```lua
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{
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-- Common fields (same name and meaning in both new and legacy syntax)
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-------------------
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-- Common fields --
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-------------------
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-- (same name and meaning in both new and legacy syntax)
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amount = 1,
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-- Number of particles spawned over the time period `time`.
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@ -10768,6 +10776,8 @@ will be ignored.
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texture = "image.png",
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-- The texture of the particle
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-- v5.6.0 and later: also supports the table format described in the
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-- following section.
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playername = "singleplayer",
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-- Optional, if specified spawns particles only on the player's client
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@ -10793,7 +10803,9 @@ will be ignored.
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-- particle texture is picked.
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-- Otherwise, the default behavior is used. (currently: any random tile)
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-- Legacy definition fields
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-------------------
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-- Legacy fields --
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-------------------
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minpos = {x=0, y=0, z=0},
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maxpos = {x=0, y=0, z=0},
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@ -10921,32 +10933,46 @@ All of the properties that can be defined in this way are listed in the next
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section, along with the datatypes they accept.
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#### List of particlespawner properties
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All of the properties in this list can be animated with `*_tween` tables
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unless otherwise specified. For example, `jitter` can be tweened by setting
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a `jitter_tween` table instead of (or in addition to) a `jitter` table/value.
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All properties in this list of type "vec3 range", "float range" or "vec3" can
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be animated with `*_tween` tables. For example, `jitter` can be tweened by
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setting a `jitter_tween` table instead of (or in addition to) a `jitter`
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table/value.
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In this section, a float range is a table defined as so: { min = A, max = B }
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A and B are your supplemented values. For a vec3 range this means they are vectors.
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Types used are defined in the previous section.
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* vec3 range `pos`: the position at which particles can appear
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* vec3 range `vel`: the initial velocity of the particle
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* vec3 range `acc`: the direction and speed with which the particle
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accelerates
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* vec3 range `size`: scales the visual size of the particle texture.
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if `node` is set, this can be set to 0 to spawn randomly-sized particles
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(just like actual node dig particles).
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* vec3 range `jitter`: offsets the velocity of each particle by a random
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amount within the specified range each frame. used to create Brownian motion.
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* vec3 range `drag`: the amount by which absolute particle velocity along
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each axis is decreased per second. a value of 1.0 means that the particle
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will be slowed to a stop over the space of a second; a value of -1.0 means
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that the particle speed will be doubled every second. to avoid interfering
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with gravity provided by `acc`, a drag vector like `vector.new(1,0,1)` can
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be used instead of a uniform value.
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* float range `bounce`: how bouncy the particles are when `collisiondetection`
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is turned on. values less than or equal to `0` turn off particle bounce;
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`1` makes the particles bounce without losing any velocity, and `2` makes
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them double their velocity with every bounce. `bounce` is not bounded but
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values much larger than `1.0` probably aren't very useful.
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* float range `exptime`: the number of seconds after which the particle
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disappears.
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* table `attract`: sets the birth orientation of particles relative to various
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shapes defined in world coordinate space. this is an alternative means of
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setting the velocity which allows particles to emerge from or enter into
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@ -10954,8 +10980,10 @@ Types used are defined in the previous section.
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velocity values within a range. the velocity calculated by this method will
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be **added** to that specified by `vel` if `vel` is also set, so in most
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cases **`vel` should be set to 0**. `attract` has the fields:
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* string `kind`: selects the kind of shape towards which the particles will
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be oriented. it must have one of the following values:
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* `"none"`: no attractor is set and the `attractor` table is ignored
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* `"point"`: the particles are attracted to a specific point in space.
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use this also if you want a sphere-like effect, in combination with
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@ -10966,25 +10994,32 @@ Types used are defined in the previous section.
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* `"plane"`: the particles are attracted to an (infinite) plane on whose
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surface `origin` designates a point in world coordinate space. use this
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for e.g. particles entering or emerging from a portal.
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* float range `strength`: the speed with which particles will move towards
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`attractor`. If negative, the particles will instead move away from that
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point.
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* vec3 `origin`: the origin point of the shape towards which particles will
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initially be oriented. functions as an offset if `origin_attached` is also
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set.
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* vec3 `direction`: sets the direction in which the attractor shape faces. for
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lines, this sets the angle of the line; e.g. a vector of (0,1,0) will
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create a vertical line that passes through `origin`. for planes, `direction`
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is the surface normal of an infinite plane on whose surface `origin` is
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a point. functions as an offset if `direction_attached` is also set.
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* entity `origin_attached`: allows the origin to be specified as an offset
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from the position of an entity rather than a coordinate in world space.
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* entity `direction_attached`: allows the direction to be specified as an offset
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* ObjectRef `origin_attached`: allows the origin to be specified as an offset
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from the position of an entity rather than a coordinate in world space.
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* ObjectRef `direction_attached`: allows the direction to be specified as an
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offset from the position of an entity rather than a coordinate in world space.
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* bool `die_on_contact`: if true, the particles' lifetimes are adjusted so
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that they will die as they cross the attractor threshold. this behavior
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is the default but is undesirable for some kinds of animations; set it to
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false to allow particles to live out their natural lives.
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* vec3 range `radius`: if set, particles will be arranged in a sphere around
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`pos`. A constant can be used to create a spherical shell of particles, a
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vector to create an ovoid shell, and a range to create a volume; e.g.
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@ -10996,9 +11031,10 @@ Types used are defined in the previous section.
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### Textures
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In versions before v5.6.0, particlespawner textures could only be specified as a single
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texture string. After v5.6.0, textures can now be specified as a table as well. This
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table contains options that allow simple animations to be applied to the texture.
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In versions before v5.6.0, particle/particlespawner textures could only be
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specified as a single texture string. After v5.6.0, textures can now be
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specified as a table as well. This table contains options that allow simple
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animations to be applied to the texture.
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```lua
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texture = {
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@ -11053,18 +11089,18 @@ texture = {
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}
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```
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Instead of setting a single texture definition, it is also possible to set a
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`texpool` property. A `texpool` consists of a list of possible particle textures.
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Every time a particle is spawned, the engine will pick a texture at random from
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the `texpool` and assign it as that particle's texture. You can also specify a
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`texture` in addition to a `texpool`; the `texture` value will be ignored on newer
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clients but will be sent to older (pre-v5.6.0) clients that do not implement
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texpools.
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For particlespawners, it is also possible to set the `texpool` property instead
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of a single texture definition. A `texpool` consists of a list of possible
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particle textures. Every time a particle is spawned, the engine will pick a
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texture at random from the `texpool` and assign it as that particle's texture.
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You can also specify a `texture` in addition to a `texpool`; the `texture`
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value will be ignored on newer clients but will be sent to older (pre-v5.6.0)
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clients that do not implement texpools.
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```lua
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texpool = {
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"mymod_particle_texture.png";
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{ name = "mymod_spark.png", fade = "out" },
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{ name = "mymod_spark.png", alpha_tween = {1, 0} },
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{
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name = "mymod_dust.png",
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alpha = 0.3,
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@ -502,22 +502,50 @@ enum ToClientCommand : u16
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TOCLIENT_SPAWN_PARTICLE = 0x46,
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/*
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-- struct range<T> { T min, T max, f32 bias };
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using range<T> = RangedParameter<T> {
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T min, max
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f32 bias
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}
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using tween<T> = TweenedParameter<T> {
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u8 style
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u16 reps
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f32 beginning
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T start, end
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}
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v3f pos
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v3f velocity
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v3f acceleration
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f32 expirationtime
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f32 size
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u8 bool collisiondetection
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u32 len
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u8[len] texture
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u8 bool vertical
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u8 collision_removal
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u8 bool collision_removal
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TileAnimation animation
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u8 glow
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u8 object_collision
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u8 bool object_collision
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u16 node_param0
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u8 node_param2
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u8 node_tile
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v3f drag
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range<v3f> bounce
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range<v3f> jitter
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range<f32> bounce
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texture {
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u8 flags (ParticleTextureFlags)
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-- bit 0: animated
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-- next bits: blend mode (BlendMode)
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tween<f32> alpha
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tween<v2f> scale
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}
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*/
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TOCLIENT_ADD_PARTICLESPAWNER = 0x47,
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@ -536,7 +564,7 @@ enum ToClientCommand : u16
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u16 amount
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f32 spawntime
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if PROTOCOL_VERSION >= 42 {
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tween<T> pos, vel, acc, exptime, size
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tween<range<T>> pos, vel, acc, exptime, size
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} else {
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v3f minpos
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v3f maxpos
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@ -550,14 +578,23 @@ enum ToClientCommand : u16
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f32 maxsize
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}
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u8 bool collisiondetection
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u32 len
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u8[len] texture
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u32 spawner_id
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u8 bool vertical
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u8 collision_removal
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u32 id
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u8 bool collision_removal
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u32 attached_id
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TileAnimation animation
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u8 glow
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u8 object_collision
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u8 bool object_collision
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u16 node_param0
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u8 node_param2
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u8 node_tile
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if PROTOCOL_VERSION < 42 {
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f32 pos_start_bias
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@ -572,6 +609,19 @@ enum ToClientCommand : u16
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-- f32 pos_end_bias
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range<v3f> vel_end
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range<v3f> acc_end
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range<f32> exptime_end
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range<f32> size_end
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}
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texture {
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u8 flags (ParticleTextureFlags)
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-- bit 0: animated
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-- next bits: blend mode (BlendMode)
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tween<f32> alpha
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tween<v2f> scale
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if (flags.animated)
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TileAnimation animation
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}
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tween<range<v3f>> drag
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@ -597,25 +647,27 @@ enum ToClientCommand : u16
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u8 spawner_flags
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bit 1: attractor_kill (particles dies on contact)
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if attraction_mode > point {
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tween<v3f> attractor_angle
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u16 attractor_origin_attachment_object_id
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tween<v3f> attractor_direction
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u16 attractor_direction_attachment_object_id
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}
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}
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tween<range<v3f>> radius
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tween<range<v3f>> drag
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u16 texpool_sz
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texpool_sz.times {
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u8 flags
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u16 texpool_size
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texpool_size.times {
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u8 flags (ParticleTextureFlags)
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-- bit 0: animated
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-- other bits free & ignored as of proto v40
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-- next bits: blend mode (BlendMode)
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tween<f32> alpha
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tween<v2f> scale
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if flags.animated {
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u32 len
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u8[len] texture
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if (flags.animated)
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TileAnimation animation
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}
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}
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*/
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