ios - 自定义 SCNGeometry 不将漫反射内容显示为纹理

Question

我正在创建自定义 SCNGeometry。首先，我将其开发为平面。它会显示，我可以将颜色应用到它的漫反射内容，但如果我尝试应用任何东西，例如 UIImage 或 CALayer，它会显示为白色。

代码:

let positions = [
    SCNVector3(-1, 0, 0),
    SCNVector3(1, 0, 0),
    SCNVector3(-1, 0, -1),
    SCNVector3(1, 0, -1)
]

let indices: [UInt8] = [
    0, 1, 2,
    1, 3, 2
]

let vertexSource = SCNGeometrySource(vertices: positions)

let indexData = Data(bytes: indices, count: indices.count)

let element = SCNGeometryElement(
    data: indexData,
    primitiveType: SCNGeometryPrimitiveType.triangles,
    primitiveCount: indices.count / 3,
    bytesPerIndex: 1)

let geometry = SCNGeometry(
    sources: [vertexSource],
    elements: [element])

geometry.firstMaterial?.diffuse.contents = UIImage(named: "homer")

Answer 1

为了能够对几何体进行纹理处理，您还需要提供 UV 坐标(纹理坐标)源。

let textureCoordinates = [
    CGPoint(x: 0, y: 0),
    CGPoint(x: 1, y: 0),
    CGPoint(x: 0, y: 1),
    CGPoint(x: 1, y: 1)
]

let uvSource = SCNGeometrySource(textureCoordinates: textureCoordinates)

let element = ...

let geometry = SCNGeometry(
    sources: [vertexSource, uvSource],
    elements: [element])