金属着色器更改摄像机 Z 值无效。

huangapple
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英文:

Metal shader changing camera z does nothing

问题

以下是您提供的Metal Shader代码的翻译部分：

  1. #include <metal_stdlib>
  2. using namespace metal;
  4. // 将角度转换为弧度的函数
  5. float degreesToRadians(float degrees) {
  6.     return degrees * (M_PI_F / 180.0);
  7. }
  9. // 生成投影矩阵的函数
  10. float4x4 generateProjectionMatrix(float fov, float aspectRatio, float near, float far) {
  11.     float yScale = 1.0 / tan(fov * 0.5);
  12.     float xScale = yScale / aspectRatio;
  13.     float zRange = near - far;
  15.     float4x4 projectionMatrix;
  16.     projectionMatrix.columns[0] = float4(xScale, 0.0, 0.0, 0.0);
  17.     projectionMatrix.columns[1] = float4(0.0, yScale, 0.0, 0.0);
  18.     projectionMatrix.columns[2] = float4(0.0, 0.0, (near + far) / zRange, -1.0);
  19.     projectionMatrix.columns[3] = float4(0.0, 0.0, 2.0 * near * far / zRange, 0.0);
  21.     return projectionMatrix;
  22. }
  24. // 生成视图矩阵的函数
  25. float4x4 generateViewMatrix(float3 cameraPosition) {
  26.     float3 eye = cameraPosition;
  27.     float3 target = float3(0.0, 0.0, 0.0); // 假设目标在原点
  28.     float3 up = float3(0.0, 1.0, 0.0); // 上方向是正Y轴
  30.     float3 zAxis = normalize(eye - target);
  31.     float3 xAxis = normalize(cross(up, zAxis));
  32.     float3 yAxis = cross(zAxis, xAxis);
  34.     float4x4 viewMatrix;
  35.     viewMatrix.columns[0] = float4(xAxis.x, yAxis.x, zAxis.x, 0.0);
  36.     viewMatrix.columns[1] = float4(xAxis.y, yAxis.y, zAxis.y, 0.0);
  37.     viewMatrix.columns[2] = float4(xAxis.z, yAxis.z, zAxis.z, 0.0);
  38.     viewMatrix.columns[3] = float4(-dot(xAxis, eye), -dot(yAxis, eye), -dot(zAxis, eye), 1.0);
  40.     return viewMatrix;
  41. }
  43. [[ stitchable ]] float2
  44. accordion(float2 position, float amount, float fov_in) {
  46.     float4 newPos = float4(position.x, position.y, 0.0, 1.0);
  48.     float3 cameraPosition = float3(0.0, 0.0, amount);
  50.     float4x4 viewMatrix = generateViewMatrix(cameraPosition);
  52.     float nearPlane = 0.1;
  53.     float farPlane = 100.0;
  54.     float aspectRatio = 1.0;
  55.     float fov = degreesToRadians(fov_in);
  57.     float4x4 projectionMatrix = generateProjectionMatrix(fov,
  58.                                                        aspectRatio,
  59.                                                        nearPlane,
  60.                                                        farPlane);
  62.     float4 final = projectionMatrix * viewMatrix * newPos;
  64.     return final.xy;
  65. }

请注意，这只是代码的翻译部分，不包括问题或额外内容。

英文:

I have the following Metal Shader code, if I move the camera X/Y the view updates correctly, however If I move the z position of the camera, it's as if nothing happens, the view renders normally without zooming in/out...I feel like I'm missing something?

Am I creating the transforms and multiplying them correctly?

  1. #include &lt;metal_stdlib&gt;
  2. using namespace metal;
  4. float degreesToRadians(float degrees) {
  5.     return degrees * (M_PI_F / 180.0);
  6. }
  8. // Function to generate a projection matrix
  9. float4x4 generateProjectionMatrix(float fov, float aspectRatio, float near, float far) {
  10.     float yScale = 1.0 / tan(fov * 0.5);
  11.     float xScale = yScale / aspectRatio;
  12.     float zRange = near - far;
  14.     float4x4 projectionMatrix;
  15.     projectionMatrix.columns[0] = float4(xScale, 0.0, 0.0, 0.0);
  16.     projectionMatrix.columns[1] = float4(0.0, yScale, 0.0, 0.0);
  17.     projectionMatrix.columns[2] = float4(0.0, 0.0, (near + far) / zRange, -1.0);
  18.     projectionMatrix.columns[3] = float4(0.0, 0.0, 2.0 * near * far / zRange, 0.0);
  20.     return projectionMatrix;
  21. }
  23. float4x4 generateViewMatrix(float3 cameraPosition) {
  24.     float3 eye = cameraPosition;
  25.     float3 target = float3(0.0, 0.0, 0.0); // Assuming the target is at the origin
  26.     float3 up = float3(0.0, 1.0, 0.0); // Up direction is positive Y-axis
  28.     float3 zAxis = normalize(eye - target);
  29.     float3 xAxis = normalize(cross(up, zAxis));
  30.     float3 yAxis = cross(zAxis, xAxis);
  32.     float4x4 viewMatrix;
  33.     viewMatrix.columns[0] = float4(xAxis.x, yAxis.x, zAxis.x, 0.0);
  34.     viewMatrix.columns[1] = float4(xAxis.y, yAxis.y, zAxis.y, 0.0);
  35.     viewMatrix.columns[2] = float4(xAxis.z, yAxis.z, zAxis.z, 0.0);
  36.     viewMatrix.columns[3] = float4(-dot(xAxis, eye), -dot(yAxis, eye), -dot(zAxis, eye), 1.0);
  38.     return viewMatrix;
  39. }
  42. [[ stitchable ]] float2
  43. accordion(float2 position, float amount, float fov_in) {
  45.     float4 newPos = float4(position.x, position.y, 0.0, 1.0);
  47.     float3 cameraPosition = float3(0.0, 0.0, amount);
  49.     float4x4 viewMatrix = generateViewMatrix(cameraPosition);
  51.     float nearPlane = 0.1;
  52.     float farPlane = 100.0;
  53.     float aspectRatio = 1.0;
  54.     float fov = degreesToRadians(fov_in);
  56.     float4x4 projectionMatrix = generateProjectionMatrix(fov,
  57.                                                        aspectRatio,
  58.                                                        nearPlane,
  59.                                                        farPlane);
  61.     float4 final = projectionMatrix * viewMatrix * newPos;
  63.     return final.xy;
  64. }

答案1

得分: 0

需要启用深度并提供深度缓冲。

来自https://metalbyexample.com/modern-metal-2/的代码：

  1. mtkView.colorPixelFormat = .bgra8Unorm_srgb
  2. mtkView.depthStencilPixelFormat = .depth32Float
  4. pipelineDescriptor.colorAttachments[0].pixelFormat = view.colorPixelFormat
  5. pipelineDescriptor.depthAttachmentPixelFormat = view.depthStencilPixelFormat
  7. let depthStencilState: MTLDepthStencilState
  9. static func buildDepthStencilState(device: MTLDevice) -> MTLDepthStencilState {
  10.     let depthStencilDescriptor = MTLDepthStencilDescriptor()
  11.     depthStencilDescriptor.depthCompareFunction = .less
  12.     depthStencilDescriptor.isDepthWriteEnabled = true
  13.     return device.makeDepthStencilState(descriptor: depthStencilDescriptor)!
  14. }
  16. depthStencilState = Renderer.buildDepthStencilState(device: device)
  18. commandEncoder.setDepthStencilState(depthStencilState)
英文:

You need to enable depth and provide a depth buffer.

Code from https://metalbyexample.com/modern-metal-2/

  1. mtkView.colorPixelFormat = .bgra8Unorm_srgb
  2. mtkView.depthStencilPixelFormat = .depth32Float
  3. pipelineDescriptor.colorAttachments[0].pixelFormat = view.colorPixelFormat
  4. pipelineDescriptor.depthAttachmentPixelFormat = view.depthStencilPixelFormat
  5. let depthStencilState: MTLDepthStencilState
  6. static func buildDepthStencilState(device: MTLDevice) -&gt; MTLDepthStencilState {
  7. let depthStencilDescriptor = MTLDepthStencilDescriptor()
  8. depthStencilDescriptor.depthCompareFunction = .less
  9. depthStencilDescriptor.isDepthWriteEnabled = true
  10. return device.makeDepthStencilState(descriptor: depthStencilDescriptor)!
  11. }
  12. depthStencilState = Renderer.buildDepthStencilState(device: device)
  13. commandEncoder.setDepthStencilState(depthStencilState)

huangapple
  • 本文由 发表于 2023年6月12日 03:50:28
  • 转载请务必保留本文链接：https://go.coder-hub.com/76452279.html
  • metal
  • shader
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