Method UpdateControllerAxes

samples/hellovr_vulkan/hellovr_vulkan_main.cpp:2469–2567

----------------------------------------------------------------------------- Purpose: Update the vertex data for the controllers as X/Y/Z lines -----------------------------------------------------------------------------

// Purpose: Update the vertex data for the controllers as X/Y/Z lines
//-----------------------------------------------------------------------------
void CMainApplication::UpdateControllerAxes()
{
	// Don't attempt to update controllers if input is not available
	if( !m_pHMD->IsInputAvailable() )
		return;

	std::vector<float> vertdataarray;

	m_uiControllerVertcount = 0;
	m_iTrackedControllerCount = 0;

	for ( vr::TrackedDeviceIndex_t unTrackedDevice = vr::k_unTrackedDeviceIndex_Hmd + 1; unTrackedDevice < vr::k_unMaxTrackedDeviceCount; ++unTrackedDevice )
	{
		if ( !m_pHMD->IsTrackedDeviceConnected( unTrackedDevice ) )
			continue;

		if( m_pHMD->GetTrackedDeviceClass( unTrackedDevice ) != vr::TrackedDeviceClass_Controller )
			continue;

		m_iTrackedControllerCount += 1;

		if( !m_rTrackedDevicePose[ unTrackedDevice ].bPoseIsValid )
			continue;

		const Matrix4 & mat = m_rmat4DevicePose[unTrackedDevice];

		Vector4 center = mat * Vector4( 0, 0, 0, 1 );

		for ( int i = 0; i < 3; ++i )
		{
			Vector3 color( 0, 0, 0 );
			Vector4 point( 0, 0, 0, 1 );
			point[i] += 0.05f;  // offset in X, Y, Z
			color[i] = 1.0;  // R, G, B
			point = mat * point;
			vertdataarray.push_back( center.x );
			vertdataarray.push_back( center.y );
			vertdataarray.push_back( center.z );

			vertdataarray.push_back( color.x );
			vertdataarray.push_back( color.y );
			vertdataarray.push_back( color.z );
		
			vertdataarray.push_back( point.x );
			vertdataarray.push_back( point.y );
			vertdataarray.push_back( point.z );
		
			vertdataarray.push_back( color.x );
			vertdataarray.push_back( color.y );
			vertdataarray.push_back( color.z );
		
			m_uiControllerVertcount += 2;
		}

		Vector4 start = mat * Vector4( 0, 0, -0.02f, 1 );
		Vector4 end = mat * Vector4( 0, 0, -39.f, 1 );
		Vector3 color( .92f, .92f, .71f );