diff --git a/extensions/reviewed/ParticleEmitter3D.json b/extensions/reviewed/ParticleEmitter3D.json
index 8514bafdd..2b5f7f904 100644
--- a/extensions/reviewed/ParticleEmitter3D.json
+++ b/extensions/reviewed/ParticleEmitter3D.json
@@ -10,7 +10,7 @@
   "name": "ParticleEmitter3D",
   "previewIconUrl": "https://asset-resources.gdevelop.io/public-resources/Icons/f2e5a34bf465f781866677762d385d6c8e9e8d203383f2df9a3b7e0fad6a2cb5_fire.svg",
   "shortDescription": "Display a large number of particles in 3D to create visual effects in a 3D game.",
-  "version": "3.2.0",
+  "version": "3.2.1",
   "description": [
     "3D particle emitters let you create and display many small particles to simulate visual effects in your game — like fire, explosions, smoke, dust, magic, rain or snow.",
     "",
@@ -254,6 +254,9 @@
             "        this.particleSystem = particleSystem;",
             "        this.sprayConeAngle = 0;",
             "        this.zoneRadius = 0;",
+            "        this.startSpeedMin = 0;",
+            "        this.startSpeedMax = 0;",
+            "        this.gravity = 0;",
             "        this.colorOverLife = colorOverLife;",
             "        this.sizeOverLife = sizeOverLife;",
             "        this.applyForce = applyForce;",
@@ -283,7 +286,7 @@
             "        if (!startLength) {",
             "            return;",
             "        }",
-            "        startLength.a = startLengthMin * this.inverseWorldScale;",
+            "        startLength.a = startLengthMin;",
             "    }",
             "",
             "    /**",
@@ -294,7 +297,7 @@
             "        if (!startLength) {",
             "            return;",
             "        }",
-            "        startLength.b = startLengthMax * this.inverseWorldScale;",
+            "        startLength.b = startLengthMax;",
             "    }",
             "",
             "    /**",
@@ -385,14 +388,31 @@
             "     * @param startSpeedMin {number}",
             "     */",
             "    setStartSpeedMin(startSpeedMin) {",
-            "        this.particleSystem.startSpeed.a = startSpeedMin * this.inverseWorldScale;",
+            "        this.startSpeedMin = startSpeedMin;",
+            "        this.updateStartSpeed();",
             "    }",
             "",
             "    /**",
             "     * @param startSpeedMax {number}",
             "     */",
             "    setStartSpeedMax(startSpeedMax) {",
-            "        this.particleSystem.startSpeed.b = startSpeedMax * this.inverseWorldScale;",
+            "        this.startSpeedMax = startSpeedMax;",
+            "        this.updateStartSpeed();",
+            "    }",
+            "",
+            "    /**",
+            "     * Velocities of particles in world space are in the Three.js world units,",
+            "     * so they need the world scale. Velocities of relative particles are in",
+            "     * the emitter units, converted by the emitter transformation.",
+            "     */",
+            "    getVelocityScale() {",
+            "        return this.particleSystem.worldSpace ? this.inverseWorldScale : 1;",
+            "    }",
+            "",
+            "    updateStartSpeed() {",
+            "        const velocityScale = this.getVelocityScale();",
+            "        this.particleSystem.startSpeed.a = this.startSpeedMin * velocityScale;",
+            "        this.particleSystem.startSpeed.b = this.startSpeedMax * velocityScale;",
             "    }",
             "",
             "    /**",
@@ -421,6 +441,8 @@
             "     */",
             "    setParticlesRelative(areParticlesRelative) {",
             "        this.particleSystem.worldSpace = !areParticlesRelative;",
+            "        this.updateStartSpeed();",
+            "        this.updateGravity();",
             "    }",
             "",
             "    /**",
@@ -440,7 +462,8 @@
             "    }",
             "",
             "    updateEmitterShape() {",
-            "        const zoneRadius = Math.max(0, this.zoneRadius) * this.inverseWorldScale;",
+            "        // The emitter transformation converts the shape to the Three.js world units.",
+            "        const zoneRadius = Math.max(0, this.zoneRadius);",
             "        // Without a zone, a spray angle of 0 emits in every direction from a point.",
             "        // With a zone, it emits straight from every point of the disc.",
             "        const isCone = this.sprayConeAngle <= 180 && (0 < this.sprayConeAngle || 0 < zoneRadius);",
@@ -475,7 +498,12 @@
             "     * @param gravity {number}",
             "     */",
             "    setGravity(gravity) {",
-            "        this.applyForce.magnitude.value = gravity * this.inverseWorldScale;",
+            "        this.gravity = gravity;",
+            "        this.updateGravity();",
+            "    }",
+            "",
+            "    updateGravity() {",
+            "        this.applyForce.magnitude.value = this.gravity * this.getVelocityScale();",
             "    }",
             "",
             "    /**",
@@ -7242,7 +7270,9 @@
                 "    layer.getRenderer().add3DRendererObject(particleSystem.emitter);",
                 "}",
                 "",
-                "particleSystem.emitter.updateMatrixWorld(true);",
+                "// Update the parents too, so that the first particles are emitted with the",
+                "// scale of the layer (the 3D renderer world scale).",
+                "particleSystem.emitter.updateWorldMatrix(true, true);",
                 "",
                 "",
                 "// See doStepPostEvents",