您可以通过创建包含文本的图像,例如 这个示例,将文本环绕在对象表面周围,然后加载并将该图像分配给漫反射属性的contents
属性。
let sphereGeometry = SCNSphere(radius: 1)
let sphereNode = SCNNode(geometry: sphereGeometry)
sphereNode.position = SCNVector3(x: 0, y: 0, z: 0)
if let textImage = UIImage(named:"TextImage") {
sphereGeometry.firstMaterial?.diffuse.contents = textImage
}
scene.rootNode.addChildNode(sphereNode)
![在此输入图片描述](https://istack.dev59.com/IO5pB.webp)
或者您可以通过编程创建带有文本的图像来实现
func imageWithText(text:String, fontSize:CGFloat = 150, fontColor:UIColor = .black, imageSize:CGSize, backgroundColor:UIColor) -> UIImage? {
let imageRect = CGRect(origin: CGPoint.zero, size: imageSize)
UIGraphicsBeginImageContext(imageSize)
defer {
UIGraphicsEndImageContext()
}
guard let context = UIGraphicsGetCurrentContext() else {
return nil
}
context.setFillColor(backgroundColor.cgColor)
context.fill(imageRect)
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = .center
let attributes = [
NSFontAttributeName: UIFont(name: "TimesNewRomanPS-BoldMT", size:fontSize),
NSParagraphStyleAttributeName: paragraphStyle,
NSForegroundColorAttributeName: fontColor
]
let textSize = text.size(attributes: attributes)
text.draw(at: CGPoint(x: imageSize.width/2 - textSize.width/2, y: imageSize.height/2 - textSize.height/2), withAttributes: attributes)
if let image = UIGraphicsGetImageFromCurrentImageContext() {
return image
}
return nil
}
并将图片应用到球体上
let sphereGeometry = SCNSphere(radius: 1)
let sphereNode = SCNNode(geometry: sphereGeometry)
sphereNode.position = SCNVector3(x: 0, y: 0, z: 0)
if let image = imageWithText(text: "Hello, World!", imageSize: CGSize(width:1024,height:1024), backgroundColor: .cyan) {
sphereGeometry.firstMaterial?.diffuse.contents = image
}
scene.rootNode.addChildNode(sphereNode)