From f89f7c88fea069766b9d70e7dd70231d56d0bf22 Mon Sep 17 00:00:00 2001
From: yuanjiajia <1139393632@qq.com>
Date: Thu, 13 Jul 2023 14:35:40 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B8=B2=E6=9F=93=E6=B5=8B=E5=BC=8F=20?=
 =?UTF-8?q?=E5=BC=80=E5=8F=91?=
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---
 src/utils/MatHelper.php | 88 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)

diff --git a/src/utils/MatHelper.php b/src/utils/MatHelper.php
index 4120912..aacf2d8 100644
--- a/src/utils/MatHelper.php
+++ b/src/utils/MatHelper.php
@@ -319,6 +319,50 @@ class MatHelper{
             $material->setVroughness($roughnessTexture);
         }
 
+        // 加载法线纹理
+        if($matOriginal->matParams->bumpTexture){
+            $textureUrl = $matOriginal->matParams->bumpTexture;
+            $textureSavaPath = $cacheFileDir.'/'.basename($textureUrl);
+            $textureSavaHandle = fopen($textureSavaPath, "w");
+            (new Client())->get($textureUrl, [RequestOptions::SINK => $textureSavaHandle]);
+
+            // 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));
+            $extension = preg_replace('/^('.$fileName.')+/','',basename($textureSavaPath));
+            $textureInvertSavaGPath = $cacheFileDir.'/'.$fileName.'_InvertG'.$extension;
+            $imagick = new Imagick($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->setImageCompressionQuality(100);
+            $imagick->writeImage($textureInvertSavaGPath);
+
+            $bumpTexture = new ImageMap(
+                ['file' => $textureInvertSavaGPath]
+            );
+            $bumpTexture->gamma = 1;
+            $bumpTexture->mapping = $mapping;
+            $scene->registerTexture($bumpTexture);
+            
+            $normalTexture = new NormalMap();
+            $normalTexture->setTexture($bumpTexture);
+            $normalTexture->scale = $matOriginal->matParams->bumpLevel;
+            $scene->registerTexture($normalTexture);
+            $material->setBumptex($normalTexture);
+        }
+
 
         return $material;
     }
@@ -443,6 +487,50 @@ class MatHelper{
             $material->setVroughness($roughnessTexture);
         }
 
+        // 加载法线纹理
+        if($matOriginal->matParams->bumpTexture){
+            $textureUrl = $matOriginal->matParams->bumpTexture;
+            $textureSavaPath = $cacheFileDir.'/'.basename($textureUrl);
+            $textureSavaHandle = fopen($textureSavaPath, "w");
+            (new Client())->get($textureUrl, [RequestOptions::SINK => $textureSavaHandle]);
+
+            // 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));
+            $extension = preg_replace('/^('.$fileName.')+/','',basename($textureSavaPath));
+            $textureInvertSavaGPath = $cacheFileDir.'/'.$fileName.'_InvertG'.$extension;
+            $imagick = new Imagick($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->setImageCompressionQuality(100);
+            $imagick->writeImage($textureInvertSavaGPath);
+
+            $bumpTexture = new ImageMap(
+                ['file' => $textureInvertSavaGPath]
+            );
+            $bumpTexture->gamma = 1;
+            $bumpTexture->mapping = $mapping;
+            $scene->registerTexture($bumpTexture);
+            
+            $normalTexture = new NormalMap();
+            $normalTexture->setTexture($bumpTexture);
+            $normalTexture->scale = $matOriginal->matParams->bumpLevel;
+            $scene->registerTexture($normalTexture);
+            $material->setBumptex($normalTexture);
+        }
+
 
         return $material;
     }