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Second Life Creation

llMakeSmoke

Deprecated
void llMakeSmoke(integer Particles, float Scale, float Velocity, float Lifetime, float Arc, string Texture, vector Offset)

Make smoke like particles. Deprecated: Use llParticleSystem instead.

Make smoky particles using texture from the objects inventory. Deprecated: Use llParticleSystem instead.

Parameters
Particles (integer)
Scale (float)
Velocity (float)
Lifetime (float)
Arc (float)
Texture (string)
Offset (vector)
Technical Details
  • Return Type: void
  • Energy: 10
  • Sleep: 0.1s

Beginning in version 1.14, the simulator uses llParticleSystem to emulate legacy llMakeSmoke particles.

Implementation Using llParticleSystem

Section titled “Implementation Using llParticleSystem”

Since llMakeSmoke is deprecated, you can replicate its behavior using llParticleSystem. Here is an implementation reference:

fakeMakeSmoke(integer particle_count, float particle_scale, float particle_speed,
             float particle_lifetime, float source_cone, string source_texture_id,
             vector local_offset)
{
    // Note: local_offset is ignored in this implementation
    llParticleSystem([
        PSYS_PART_FLAGS,            PSYS_PART_INTERP_COLOR_MASK | PSYS_PART_INTERP_SCALE_MASK | PSYS_PART_EMISSIVE_MASK | PSYS_PART_WIND_MASK,
        PSYS_SRC_PATTERN,           PSYS_SRC_PATTERN_ANGLE_CONE,
        PSYS_PART_START_COLOR,      <1.0, 1.0, 1.0>,
        PSYS_PART_END_COLOR,        <1.0, 1.0, 1.0>,
        PSYS_PART_START_ALPHA,      1.00,
        PSYS_PART_END_ALPHA,        0.05,
        PSYS_PART_START_SCALE,      <particle_scale, particle_scale, 0.0>,
        PSYS_PART_END_SCALE,        <10, 10, 0.0>,
        PSYS_PART_MAX_AGE,          3.0,
        PSYS_SRC_ACCEL,             <0.0, 0.0, 0.0>,
        PSYS_SRC_TEXTURE,           source_texture_id,
        PSYS_SRC_BURST_RATE,        10.0 / particle_count,
        PSYS_SRC_ANGLE_BEGIN,       0.0,
        PSYS_SRC_ANGLE_END,         source_cone * PI,
        PSYS_SRC_BURST_PART_COUNT,  1,
        PSYS_SRC_BURST_RADIUS,      0.0,
        PSYS_SRC_BURST_SPEED_MIN,   particle_speed,
        PSYS_SRC_BURST_SPEED_MAX,   particle_speed,
        PSYS_SRC_MAX_AGE,           particle_lifetime / 2,
        PSYS_SRC_OMEGA,             <0.0, 0.0, 0.0>
    ]);
}

Known Discrepancies

Section titled “Known Discrepancies”

When migrating to llParticleSystem, be aware of these differences from the original llMakeSmoke:

  1. The original llMakeSmoke has random particle lifetime, which cannot be created in the current particle system via a single call
  2. The original llMakeSmoke has continual particle growth throughout its lifetime, ending well past the 4m limit of the current system for long-lived particles
  3. Several values are not taken verbatim in the original particle system (velocity is not m/sec, for instance, and particle count can be wildly off); these are approximated in this implementation via basic divisors
  4. There is no way to duplicate the offset from the old function within the new particle system

See Also

Section titled “See Also”