From 9075931c517ac3402c1d944d709e71cccac8fd5d Mon Sep 17 00:00:00 2001
From: Onek8 <mail@1k8.org>
Date: Tue, 13 May 2025 17:58:05 +0000
Subject: [PATCH] moisesjpelaez - Add particles random size

---
 leenkx/Sources/iron/object/ParticleSystem.hx | 34 ++++++++++++++++----
 1 file changed, 27 insertions(+), 7 deletions(-)

diff --git a/leenkx/Sources/iron/object/ParticleSystem.hx b/leenkx/Sources/iron/object/ParticleSystem.hx
index 245c525..6e55a36 100644
--- a/leenkx/Sources/iron/object/ParticleSystem.hx
+++ b/leenkx/Sources/iron/object/ParticleSystem.hx
@@ -51,6 +51,7 @@ class ParticleSystem {
 		seed = pref.seed;
 		particles = [];
 		ready = false;
+		
 		Data.getParticle(sceneName, pref.particle, function(b: ParticleData) {
 			data = b;
 			r = data.raw;
@@ -70,7 +71,13 @@ class ParticleSystem {
 			lifetime = r.lifetime / frameRate;
 			animtime = (r.frame_end - r.frame_start) / frameRate;
 			spawnRate = ((r.frame_end - r.frame_start) / r.count) / frameRate;
-			for (i in 0...r.count) particles.push(new Particle(i));
+
+			for (i in 0...r.count) {
+				var particle = new Particle(i);
+				particle.sr = 1 - Math.random() * r.size_random;
+				particles.push(particle);
+			}
+
 			ready = true;
 		});
 	}
@@ -108,7 +115,7 @@ class ParticleSystem {
 		}
 
 		// Animate
-		time += Time.realDelta * speed;
+		time += Time.delta * speed;
 		lap = Std.int(time / animtime);
 		lapTime = time - lap * animtime;
 		count = Std.int(lapTime / spawnRate);
@@ -143,7 +150,7 @@ class ParticleSystem {
 	}
 
 	function setupGeomGpu(object: MeshObject, owner: MeshObject) {
-		var instancedData = new Float32Array(particles.length * 3);
+		var instancedData = new Float32Array(particles.length * 6);
 		var i = 0;
 
 		var normFactor = 1 / 32767; // pa.values are not normalized
@@ -162,6 +169,10 @@ class ParticleSystem {
 					instancedData.set(i, pa.values[j * pa.size    ] * normFactor * scaleFactor.x); i++;
 					instancedData.set(i, pa.values[j * pa.size + 1] * normFactor * scaleFactor.y); i++;
 					instancedData.set(i, pa.values[j * pa.size + 2] * normFactor * scaleFactor.z); i++;
+
+					instancedData.set(i, p.sr); i++;
+					instancedData.set(i, p.sr); i++;
+					instancedData.set(i, p.sr); i++;
 				}
 
 			case 1: // Face
@@ -185,6 +196,10 @@ class ParticleSystem {
 					instancedData.set(i, pos.x * normFactor * scaleFactor.x); i++;
 					instancedData.set(i, pos.y * normFactor * scaleFactor.y); i++;
 					instancedData.set(i, pos.z * normFactor * scaleFactor.z); i++;
+
+					instancedData.set(i, p.sr); i++;
+					instancedData.set(i, p.sr); i++;
+					instancedData.set(i, p.sr); i++;
 				}
 
 			case 2: // Volume
@@ -195,9 +210,13 @@ class ParticleSystem {
 					instancedData.set(i, (Math.random() * 2.0 - 1.0) * scaleFactorVolume.x); i++;
 					instancedData.set(i, (Math.random() * 2.0 - 1.0) * scaleFactorVolume.y); i++;
 					instancedData.set(i, (Math.random() * 2.0 - 1.0) * scaleFactorVolume.z); i++;
+
+					instancedData.set(i, p.sr); i++;
+					instancedData.set(i, p.sr); i++;
+					instancedData.set(i, p.sr); i++;
 				}
 		}
-		object.data.geom.setupInstanced(instancedData, 1, Usage.StaticUsage);
+		object.data.geom.setupInstanced(instancedData, 3, Usage.StaticUsage);
 	}
 
 	function fhash(n: Int): Float {
@@ -236,9 +255,10 @@ class ParticleSystem {
 
 class Particle {
 	public var i: Int;
-	public var x = 0.0;
-	public var y = 0.0;
-	public var z = 0.0;
+	public var px = 0.0;
+	public var py = 0.0;
+	public var pz = 0.0;
+	public var sr = 1.0; // Size random
 	public var cameraDistance: Float;
 
 	public function new(i: Int) {