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Fix wrong depth values returned by TinyRenderer

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This commit is contained in:
Michel Breyer
2017-11-17 14:45:37 +01:00
parent 6214ce5f93
commit 5138fe2c55
1 changed files with 5 additions and 4 deletions
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9
examples/SharedMemory/TinyRendererVisualShapeConverter.cpp
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@@ -1025,12 +1025,13 @@ void TinyRendererVisualShapeConverter::copyCameraImageData(unsigned char* pixels
{ {
if (depthBuffer) if (depthBuffer)
{ {
float distance = -m_data->m_depthBuffer[i+startPixelIndex];
float farPlane = m_data->m_camera.getCameraFrustumFar(); float farPlane = m_data->m_camera.getCameraFrustumFar();
float nearPlane = m_data->m_camera.getCameraFrustumNear(); float nearPlane = m_data->m_camera.getCameraFrustumNear();
btClamp(distance,nearPlane,farPlane); // TinyRenderer returns clip coordinates, transform to eye coordinates first
float z_c = -m_data->m_depthBuffer[i+startPixelIndex];
float distance = (farPlane - nearPlane) / (farPlane + nearPlane) * (z_c + 2. * farPlane * nearPlane / (farPlane - nearPlane));
// the depth buffer value is between 0 and 1 // the depth buffer value is between 0 and 1
float a = farPlane / (farPlane - nearPlane); float a = farPlane / (farPlane - nearPlane);
float b = farPlane * nearPlane / (nearPlane - farPlane); float b = farPlane * nearPlane / (nearPlane - farPlane);