from paraview.simple import *

# Disable automatic rendering for batch performance
paraview.simple._DisableFirstRenderCameraReset()

# Load data source
reader = OpenFOAMReader(registrationName='case', FileName='case.foam')
reader.MeshRegions = ['internalMesh']
reader.CellArrays = ['U', 'p']

# Set time step
animationScene = GetAnimationScene()
animationScene.UpdateAnimationUsingDataTimeSteps()
animationScene.AnimationTime = reader.TimestepValues[-1]  # Last time step

# Create render view
renderView = GetActiveViewOrCreate('RenderView')
renderView.ViewSize = [1920, 1080]

# Empty file triggers OpenFOAM reader
touch /path/to/case/case.foam

def setup_color_map(display, array_name, component=None, preset='Cool to Warm'):
    """Configure color mapping for a display."""
    ColorBy(display, ('POINTS', array_name, component) if component else ('POINTS', array_name))

    color_tf = GetColorTransferFunction(array_name)
    opacity_tf = GetOpacityTransferFunction(array_name)

    # Apply preset
    color_tf.ApplyPreset(preset, True)

    # Auto-rescale to data range
    color_tf.RescaleTransferFunction(*display.RescaleTransferFunctionToDataRange(True))

    # Show color bar
    display.SetScalarBarVisibility(GetActiveView(), True)

    return color_tf

def set_camera(view, position, focal_point, up=(0, 0, 1)):
    """Set camera position and orientation."""
    view.CameraPosition = position
    view.CameraFocalPoint = focal_point
    view.CameraViewUp = up
    view.CameraParallelScale = 1.0
    Render()

def set_isometric_view(view):
    """Standard isometric engineering view."""
    view.ResetCamera()
    view.CameraPosition = [1, 1, 1]
    view.CameraFocalPoint = [0, 0, 0]
    view.CameraViewUp = [0, 0, 1]
    view.ResetCamera()
    Render()