From 4815fe45f406ed65aecb6bd5988d972339406217 Mon Sep 17 00:00:00 2001
From: QuantumCoderQC <QuantumCoderQC@gmail.com>
Date: Sat, 7 Oct 2023 14:10:03 +0200
Subject: [PATCH] calculate normal matrix for billboards

---
 Sources/iron/object/Uniforms.hx | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/Sources/iron/object/Uniforms.hx b/Sources/iron/object/Uniforms.hx
index 8cf81b2f..a24e268d 100644
--- a/Sources/iron/object/Uniforms.hx
+++ b/Sources/iron/object/Uniforms.hx
@@ -939,6 +939,34 @@ class Uniforms {
 					helpMat3.setFrom4(helpMat);
 					m = helpMat3;
 				}
+				case "_normalMatrixSphere": {
+					helpMat.setFrom(object.transform.world);
+					// Align to camera..
+					helpMat.multmat(camera.V);
+					helpMat._00 = 1.0; helpMat._10 = 0.0; helpMat._20 = 0.0;
+					helpMat._01 = 0.0; helpMat._11 = 1.0; helpMat._21 = 0.0;
+					helpMat._02 = 0.0; helpMat._12 = 0.0; helpMat._22 = 1.0;
+					helpMat2.getInverse(camera.V);
+					helpMat.multmat(helpMat2);
+					helpMat2.getInverse(helpMat);
+					helpMat2.transpose3x3();
+					helpMat3.setFrom4(helpMat2);
+					m = helpMat3;
+				}
+				case "_normalMatrixCylinder": {
+					helpMat.setFrom(object.transform.world);
+					// Align to camera..
+					helpMat.multmat(camera.V);
+					helpMat._00 = 1.0; helpMat._20 = 0.0;
+					helpMat._01 = 0.0; helpMat._21 = 0.0;
+					helpMat._02 = 0.0; helpMat._22 = 1.0;
+					helpMat2.getInverse(camera.V);
+					helpMat.multmat(helpMat2);
+					helpMat2.getInverse(helpMat);
+					helpMat2.transpose3x3();
+					helpMat3.setFrom4(helpMat2);
+					m = helpMat3;
+				}
 				case "_viewMatrix3": {
 					#if arm_centerworld
 					helpMat3.setFrom4(vmat(camera.V));