BabylonJS-视差映射 
  

BabylonJS-视差映射


视差映射也称为偏移映射。它使用一个高度图,该高度图用作材料纹理的偏移量,以增强几何图形表面的浮雕效果。在3D世界中,具有一定深度的石墙将具有更明显的外观,并且对于最终用户将看起来逼真。在较陡的视角下,纹理坐标的位移更大,由于视线变化而产生的视差效应会给人以深度错觉。

Parallex映射与标准材质一起使用。我们在标准材料一章中了解了这一点。

视差映射具有3个属性。

  • material.useParallax = true; −这将启用视差映射。要使用此属性,您需要首先为材质指定凹凸纹理。

  • material.useParallaxOcclusion = true; −要使用此属性,必须将useParallax设置为true。它启用了视差遮挡。

  • material.parallaxScaleBias = 0.1; −为要应用于网格的深度应用比例因子.0.05至0.1之间的值适用于视差。对于遮挡,可以达到0.2。

演示版

<meta charset="utf-8">
      <title>BabylonJs - Basic Element-Creating Scene</title>
      <script src="babylon.js"></script>
      <style>
         canvas {width: 100%; height: 100%;}
      </style>
   

   
      <canvas id="renderCanvas"></canvas>
      <script type="text/javascript">
         var canvas = document.getElementById("renderCanvas");
         var engine = new BABYLON.Engine(canvas, true);
         
         var createScene  = function() {
            // This creates a basic Babylon Scene object (non-mesh)
            var scene = new BABYLON.Scene(engine);

            // This creates and positions a free camera (non-mesh)
            var camera = new BABYLON.ArcRotateCamera("camera1", 0, Math.PI / 2, 100, new BABYLON.Vector3(0, 0, 0), scene);
            camera.attachControl(canvas, false);

            // This targets the camera to scene origin
            camera.setTarget(BABYLON.Vector3.Zero());

            // This creates a light, aiming 0,1,0 - to the sky (non-mesh)
            var light = new BABYLON.HemisphericLight("light1", new BABYLON.Vector3(0, 1, 0), scene);

            // Default intensity is 1. Let's dim the light a small amount
            light.intensity = 0.7;

            var mesh = BABYLON.Mesh.CreateBox("box01", 25, scene);
            mesh.position = new BABYLON.Vector3(0, 0, 0);

            var brickWallDiffURL = "images/a1.png";
            var brickWallNHURL = "images/a2.png";
            var stoneDiffURL = "images/pebble.jpg";
            var stoneNHURL = "images/a3.png";

            var stoneDiffuseTexture = new BABYLON.Texture(stoneDiffURL, scene);
            
            var stoneNormalsHeightTexture = new BABYLON.Texture(stoneNHURL, scene);
            
            var wallDiffuseTexture = new BABYLON.Texture(brickWallDiffURL, scene);
            
            var wallNormalsHeightTexture = new BABYLON.Texture(brickWallNHURL, scene);
            
            var normalsHeightTexture = stoneNormalsHeightTexture;

            var material = new BABYLON.StandardMaterial("mtl01", scene);
            material.diffuseTexture = stoneDiffuseTexture;
            material.bumpTexture = stoneNormalsHeightTexture;
            
            material.useParallax = true;
            material.useParallaxOcclusion = true;
            material.parallaxScaleBias = 0.1;
            material.specularPower = 1000.0;
            material.specularColor = new BABYLON.Color3(0.5, 0.5, 0.5);
            mesh.material = material;    
            return scene;        
         };
         var scene = createScene();
         engine.runRenderLoop(function() {
            scene.render();
         });
      </script>
   

输出

上面的代码行将生成以下输出-

视差贴图

在此演示中,我们使用了图像a1.png,a2.png,pebble.jpga3.png 。图像存储在本地的图像/文件夹中,并且也粘贴在下面以供参考。您可以下载您选择的任何图像并在演示链接中使用。

图片/a1.png

A1墙

图片/a2.png

A2墙

图片/pebble.jpg

A1墙

images / a3.png

A3墙

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