ios - ARKit 添加了 X 翻转的 2D 视频
<p><p>所以我有以下代码来创建自定义墙</p>
<pre><code> let wall = SCNPlane(width: CGFloat(distance),
height: CGFloat(height))
wall.firstMaterial = wallMaterial()
let node = SCNNode(geometry: wall)
// always render before the beachballs
node.renderingOrder = -10
// get center point
node.position = SCNVector3(from.x + (to.x - from.x) * 0.5,
from.y + height * 0.5,
from.z + (to.z - from.z) * 0.5)
node.eulerAngles = SCNVector3(0,
-atan2(to.x - node.position.x, from.z - node.position.z) - Float.pi * 0.5,
0)
</code></pre>
<p>现在我在 HitTest 中添加简单的 SCNPlane 并添加视频(skscene 到它)</p>
<pre><code> // first.node is hittest result
let node = SCNNode(geometry: SCNPlane(width: CGFloat(width) , height:CGFloat(height))
node.geometry?.firstMaterial?.isDoubleSided = true
node.geometry?.firstMaterial?.diffuse.contents = self.create2DVideoScene(xScale: first.node.eulerAngles.y < 0 ? -1 : nil)
node.position = nodesWithDistance.previous.node.mainNode.position
node.eulerAngles = first.node.eulerAngles
</code></pre>
<p>这里我是如何创建二维节点的</p>
<pre><code> /// Creates 2D video scene
private func create2DVideoScene (xScale:CGFloat?) -> SKScene {
var videoPlayer = AVPlayer()
if let validURL = Bundle.main.url(forResource: "video", withExtension: "mp4", subdirectory: "/art.scnassets") {
let item = AVPlayerItem(url: validURL)
videoPlayer = AVPlayer(playerItem: item)
}
let videoNode = SKVideoNode(avPlayer: videoPlayer)
videoNode.yScale *= -1
// While debug I observe that if first.node.rotation.y in- , then we need to change xScale to -1 (when wall draw from right -> left )
if let xScale = xScale {
videoNode.xScale *= xScale
}
videoNode.play()
let skScene = SKScene(size: self.sceneView.frame.size)
skScene.scaleMode = .aspectFill
skScene.backgroundColor = .green
skScene.addChild(videoNode)
videoNode.position = CGPoint(x: skScene.size.width/2, y: skScene.size.height/2)
videoNode.size = skScene.size
return skScene
}
</code></pre>
<p><strong>问题</strong>::如果我从左到右绘制墙节点意味着第一个点在左侧，另一个点在右侧并在它们之间绘制墙。然后视频翻转。</p>
<p>如果我从右到左绘制意味着第一个点在右侧，第二个点在左侧并在它们之间画线，那么视频就很好了。</p>
<p>为了解决这个问题，我检查了墙 eulerAngles 检查行 <code>self.create2DVideoScene</code> 但这并不是在现实世界的每个领域都有效</p>
<p>我希望视频不应该在用户面前开始翻转</p>
<p><strong>编辑</strong></p>
<p>视频被翻转是因为 <code> eulerAngles</code> 在创建墙时在两种情况下都不同</p>
<blockquote>
<p>Angle point1 to point2 --> (0.000000 -1.000000 0.000000 3.735537)</p>
<p>Angle point2 to point1 -- > (0.000000 -1.000000 0.000000 0.478615)</p>
</blockquote>
<hr/>
<p>问题视频<a href="https://vimeo.com/300709584" rel="noreferrer noopener nofollow">Click here to play video</a> </p>
<p>请提供此问题的建议或解决方案。</p>
<p> <a href="/image/NY4S1.png" rel="noreferrer noopener nofollow"><img src="/image/NY4S1.png" alt="enter image description here"/></a> </p>
<p><strong>视频翻转</strong></p>
<p> <a href="/image/s6cXn.png" rel="noreferrer noopener nofollow"><img src="/image/s6cXn.png" alt="Flipped"/></a> </p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我已经解决了临时解决方案的问题，仍在寻找更好的解决方案</p>
<p>问题是墙。当从右到左方向绘制时，墙会翻转到相机的另一侧。我已经通过设置 isDoubleSided = false 并通过将图像应用为具有文本的漫反射内容来解决这个问题，我可以看到图像本身被翻转了。</p>
<p>我尝试了很多东西，但这个对我有帮助</p>
<ol>
<li>归一化向量</li>
<li>找到 SCNVectors 之间的交叉点</li>
<li>如果 y > 0 我只是从值交换到值</li>
</ol>
<p>代码</p>
<pre><code> let normalizedTO = to.normalized()
let normalizedFrom = from.normalized()
let angleBetweenTwoVectors = normalizedTO.cross(normalizedFrom)
var from = from
var to = to
if angleBetweenTwoVectors.y > 0 {
let temp = from
from = to
to = temp
}
// Inside extension of SCNVector3
func normalized() -> SCNVector3 {
if self.length() == 0 {
return self
}
return self / self.length()
}
func cross(_ vec: SCNVector3) -> SCNVector3 {
return SCNVector3(self.y * vec.z - self.z * vec.y, self.z * vec.x - self.x * vec.z, self.x * vec.y - self.y * vec.x)
}
</code></pre>
<p>希望对您有所帮助。如果有人知道更好的解决方案，请回答。 </p></p>
<p style="font-size: 20px;">关于ios - ARKit 添加了 X 翻转的 2D 视频，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/53282351/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/53282351/
</a>
</p>
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