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material_params/README.md

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+Shows how to control material nodes at run-time.
+Press 1, 2, 3 to change parameters.
+
+- Enable `Parameter` property in `Logic Node Editor - Properties - Leenkx Material Node`
+- RGB, Value and Image Texture nodes are supported
+- See `MyTrait` script to set material parameters using Haxe
+- See `NodeTree` to set material parameters using logic nodes
+
+https://github.com/leenkx3d/leenkx/wiki/materials#material-parameters

material_params/Sources/lnx/MyTrait.hx

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+package lnx;
+
+import iron.math.Vec4;
+import iron.object.Object;
+import iron.object.Uniforms;
+import iron.data.Data;
+import iron.data.MaterialData;
+import iron.system.Time;
+
+class MyTrait extends iron.Trait {
+
+	var tex1:kha.Image = null;
+	var tex2:kha.Image = null;
+
+	public function new() {
+		super();
+		notifyOnInit(() -> {
+			// Register link callbacks
+			Uniforms.externalVec3Links.push(vec3Link);
+			Uniforms.externalFloatLinks.push(floatLink);
+			Uniforms.externalTextureLinks.push(textureLink);
+		});
+		Data.getImage("tex1.png", img -> tex1 = img );
+		Data.getImage("tex2.png", img -> tex2 = img );
+	}
+
+	function vec3Link(object:Object, mat:MaterialData, link:String):Vec4 {
+		// object - currently bound object
+		// mat - currently bound material
+		// link - material node name
+		if (link == "RGB") {
+			var t = Time.time();
+			return new Vec4(Math.sin(t) * 0.5 + 0.5, Math.cos(t) * 0.5 + 0.5, Math.sin(t + 0.5) * 0.5 + 0.5);
+		}
+		return null;
+	}
+
+	function floatLink(object:Object, mat:MaterialData, link:String):Null<kha.FastFloat> {
+		if (link == "Value") {
+			var t = Time.time();
+			return Math.floor(t);
+		}
+		return null;
+	}
+
+	function textureLink(object:Object, mat:MaterialData, link:String):kha.Image {
+		if (link == "Image Texture") {
+			var t = Time.time();
+			return Math.sin(t) > 0 ? tex1 : tex2;
+		}
+		return null;
+	}
+}