From c85c3aeced3d924f3e98cfbe048bb4e6ba89bcae Mon Sep 17 00:00:00 2001
From: yuanjiajia <1139393632@qq.com>
Date: Wed, 5 Jul 2023 23:31:01 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B8=B2=E6=9F=93=E6=B5=8B=E5=BC=8F=20?=
 =?UTF-8?q?=E6=A1=88=E4=BE=8B=20=E5=BC=80=E5=8F=91?=
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---
 examples/testImage.php  | 37 +++++++++++++++++++++++++++++++++++++
 src/utils/MatHelper.php | 25 ++++++++++++++++++++++++-
 2 files changed, 61 insertions(+), 1 deletion(-)
 create mode 100644 examples/testImage.php

diff --git a/examples/testImage.php b/examples/testImage.php
new file mode 100644
index 0000000..378ce3b
--- /dev/null
+++ b/examples/testImage.php
@@ -0,0 +1,37 @@
+<?php
+
+
+
+namespace Blobt\Luxcore\scene;
+
+use Imagick;
+
+include dirname(dirname(__FILE__)) . "/vendor/autoload.php";
+
+const OPEN = true;
+const CLOSE = false;
+
+$imagick = new \Imagick(realpath("/media/yuanjiajia/zhiTai_300GB_P4/LuxcoreModel/normal_maps1.jpg"));
+$imageIterator = $imagick->getPixelIterator();
+
+$ll = 0;
+foreach ($imageIterator as $row => $pixels) {
+    foreach ($pixels as $column => $pixel) {
+        // 获取每个像素色值;
+        $value = $pixel->getColor();
+
+        // 反相绿色通道色值;
+        $r = $value["r"];
+        $g = abs(($value["g"] - 255));
+        $b = $value["b"];
+        $a = $value["a"];
+        $pixel->setColor("rgba({$r}, {$g}, {$b}, {$a})");
+    }
+    $imageIterator->syncIterator();
+}
+
+$imagick->writeImage("/media/yuanjiajia/zhiTai_300GB_P4/LuxcoreModel/normal_maps1-g.jpg");
+
+
+
+?>
diff --git a/src/utils/MatHelper.php b/src/utils/MatHelper.php
index d14a934..262982b 100644
--- a/src/utils/MatHelper.php
+++ b/src/utils/MatHelper.php
@@ -107,8 +107,31 @@ class MatHelper{
             $textureHandle = fopen($textureSavaPath, "w");
             (new Client())->get($textureUrl, [RequestOptions::SINK => $textureHandle]);
 
+            // 因为 LuxCore 使用 opengl 规范的法线纹理格式，与 babylon 使用的 DirectX 不同，
+            // 所以这里需要反转 G 通道色值,以保证法线纹理应用效果与 babylon 一致。
+            $fileName = preg_replace('/(\.[^\.]+)$/','',basename($textureSavaPath));
+            $suffixName = preg_replace('/^('.$fileName.')+/','',basename($textureSavaPath));
+            $textureInvertGPath = $downloadDir.$fileName.'_InvertG'.$suffixName;
+            $imagick = new \Imagick($textureSavaPath);
+            $imageIterator = $imagick->getPixelIterator();
+            foreach ($imageIterator as $row => $pixels) {
+                foreach ($pixels as $column => $pixel) {
+                    // 获取每个像素色值;
+                    $value = $pixel->getColor();
+                    // 反相绿色通道色值;
+                    $r = $value["r"];
+                    $g = abs(($value["g"] - 255));
+                    $b = $value["b"];
+                    $a = $value["a"];
+                    $pixel->setColor("rgba({$r}, {$g}, {$b}, {$a})");
+                }
+                $imageIterator->syncIterator();
+            }
+            $imagick->writeImage($textureInvertGPath);
+
+
             $bumpTexture = new ImageMap(
-                ['file' => $textureSavaPath]
+                ['file' => $textureInvertGPath]
             );
             $bumpTexture->gamma = 1;
             $bumpTexture->mapping = $mapping;