我怎樣才能讓我的網格脫離屏幕？

Question

我無法弄清楚如何檢測它會關閉屏幕，任何人可以幫助？我正在使用WebGL和Three.js。

Answer 1

您可以使用Frustum測試，有點像這樣：

// Create a new Frustum object (for efficiency, do this only once) 
var frustum = new THREE.Frustum(); 
// Helper matrix (for efficiency, do this only once) 
var projScreenMatrix = new THREE.Matrix4(); 

// Set the matrix from camera matrices (which are updated on each renderer.render() call) 
projScreenMatrix.multiply(camera.projectionMatrix, camera.matrixWorldInverse); 
// Update the frustum 
frustum.setFromMatrix(projScreenMatrix); 
// Test for visibility 
if (!frustum.contains(object)) { 
    // It's off-screen! 
} 

這是從WebGLRenderer sources複製。