LiRuochen_WorkFlow/ScreenDetectionLayerPicker
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修复摄像机的矩阵变换计算，让摄像机支持正交视图

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lrss3
2026-06-12 10:54:11 +08:00
parent 1e017648c6
commit da7affa80c
1 changed files with 18 additions and 14 deletions
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Runtime/MeshDetection_URP/GeoLayerPickerRenderPassFeature.cs
+18 -14
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@@ -673,21 +673,20 @@ namespace XericLibrary.PostProcess
float ndcYMin = passSampleRect.y * 2f - 1f; float ndcYMin = passSampleRect.y * 2f - 1f;
float ndcYMax = (passSampleRect.y + passSampleRect.height) * 2f - 1f; float ndcYMax = (passSampleRect.y + passSampleRect.height) * 2f - 1f;
// 将 NDC 子区域 [ndcMin, ndcMax] 映射到 [-1, 1] // 使用 remap 矩阵将 NDC 子区域映射到 [-1, 1]
// 投影矩阵变换: ndc = -m00 * viewX/viewZ - m02 // remap * proj 在 clip space 中做仿射变换：
// 修改后: ndc_new = scale * ndc_original - offset // clipX' = remap.m00 * clipX + remap.m03 * clipW
// ndcMin → -1: scale * ndcMin - offset = -1 → offset = scale * ndcMin + 1 // clipW' = clipW（不变）
// ndcMax → +1: scale * ndcMax - offset = +1 → scale = 2/(ndcMax - ndcMin) // ndc' = clipX'/clipW' = remap.m00 * ndc + remap.m03
float scaleX = 2f / (ndcXMax - ndcXMin); // 边界: ndcMin → -1, ndcMax → +1
float scaleY = 2f / (ndcYMax - ndcYMin); // 此法对透视投影和正交投影均正确
float offsetX = 1f + ndcXMin * scaleX; Matrix4x4 remap = Matrix4x4.identity;
float offsetY = 1f + ndcYMin * scaleY; remap.m00 = 2f / (ndcXMax - ndcXMin);
remap.m03 = -(ndcXMax + ndcXMin) / (ndcXMax - ndcXMin);
projMatrix.m00 *= scaleX; remap.m11 = 2f / (ndcYMax - ndcYMin);
projMatrix.m11 *= scaleY; remap.m13 = -(ndcYMax + ndcYMin) / (ndcYMax - ndcYMin);
projMatrix.m02 += offsetX;
projMatrix.m12 += offsetY;
projMatrix = remap * projMatrix;
projMatrix = GL.GetGPUProjectionMatrix(projMatrix, true); projMatrix = GL.GetGPUProjectionMatrix(projMatrix, true);
cmd.SetViewProjectionMatrices(viewMatrix, projMatrix); cmd.SetViewProjectionMatrices(viewMatrix, projMatrix);
cmd.SetViewport(new Rect(0, 0, passRTHandle.rt.width, passRTHandle.rt.height)); cmd.SetViewport(new Rect(0, 0, passRTHandle.rt.width, passRTHandle.rt.height));
@@ -962,6 +961,11 @@ namespace XericLibrary.PostProcess
if (rawData.Length == 0) return; if (rawData.Length == 0) return;
// 修复：使用 m_ReadbackBufferHandle.rt 获取宽高 // 修复：使用 m_ReadbackBufferHandle.rt 获取宽高
if (m_ReadbackBufferHandle == null)
{
Debug.LogWarning("[GeoLayerPicker] 更新时机不对！");
return;
}
int width = m_ReadbackBufferHandle.rt.width; int width = m_ReadbackBufferHandle.rt.width;
int height = m_ReadbackBufferHandle.rt.height; int height = m_ReadbackBufferHandle.rt.height;
int count = m_DecodedDataArray.Length; int count = m_DecodedDataArray.Length;