add 'min_angular_vel', 'max_angular_vel' properties

src/graphics/render/Emitter.cpp

@@ -88,6 +88,11 @@ void Emitter::update(
             particle.angle =
                 random.randFloat() * preset.angleSpread * glm::pi<float>() * 2;
         }
+        particle.angularVelocity =
+            (preset.minAngularVelocity +
+            random.randFloat() *
+                (preset.maxAngularVelocity - preset.minAngularVelocity)) *
+                ((random.rand() % 2) * 2 - 1);
 
         glm::vec3 spawnOffset = generate_coord(preset.spawnShape);
         spawnOffset *= preset.spawnSpread;

src/graphics/render/Emitter.hpp

@@ -29,6 +29,8 @@ struct Particle {
     UVRegion region;
     /// @brief Current rotation angle
     float angle;
+    /// @brief Angular velocity
+    float angularVelocity;
 };
 
 class Texture;

src/graphics/render/ParticlesRenderer.cpp

@@ -31,12 +31,14 @@ static inline void update_particle(
     const auto& preset = particle.emitter->preset;
     auto& pos = particle.position;
     auto& vel = particle.velocity;
+    auto& angle = particle.angle;
 
     vel += delta * preset.acceleration;
     if (preset.collision && chunks.isObstacleAt(pos + vel * delta)) {
         vel *= 0.0f;
     }
     pos += vel * delta;
+    angle += particle.angularVelocity * delta;
     particle.lifetime -= delta;
 }