### Example: Multi-laser Job with Synchronization and Pause

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

Illustrates a multi-laser job setup where lasers are synchronized and pauses are introduced for thermal management. Requires defining `vector_blocks` and setting `laser_index`, `marking_params_key`, `sync_block`, and `exposure_pause`.

```python
# Laser 0 processes left side
block_l0 = work_plane.vector_blocks.add()
block_l0._hatches.points.extend([0, 0, 45, 0, 0, 1, 45, 1])
block_l0.laser_index = 0
block_l0.marking_params_key = 0

# Laser 1 processes right side
block_l1 = work_plane.vector_blocks.add()
block_l1._hatches.points.extend([55, 0, 100, 0, 55, 1, 100, 1])
block_l1.laser_index = 1
block_l1.marking_params_key = 0

# Laser 0 must wait for Laser 1 before processing overlap zone
sync_block = work_plane.vector_blocks.add()
sync_block.sync_block.vector_block_index_to_wait_on = 1  # Wait for block index 1
sync_block.laser_index = 0

# Process overlap zone with Laser 0
overlap_block = work_plane.vector_blocks.add()
overlap_block._hatches.points.extend([45, 0, 55, 0, 45, 1, 55, 1])
overlap_block.laser_index = 0
overlap_block.marking_params_key = 1  # Different params for overlap

# Add pause for thermal management
pause_block = work_plane.vector_blocks.add()
pause_block.exposure_pause.pause_in_us = 500000  # 500ms pause
pause_block.laser_index = 0
```

--------------------------------

### Create a Job in Python

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

Example of creating a Job object in Python using the open_vector_format_pb2 library. Demonstrates setting job metadata, parameters, and marking parameters.

```python
import open_vector_format_pb2 as ovf

job = ovf.Job()
job.job_meta_data.job_name = "Sample LPBF Job"
job.job_meta_data.author = "Operator"
job.job_meta_data.job_creation_time = 1698765432  # Unix timestamp
job.job_meta_data.version = 1
job.num_work_planes = 100

# Set job-level parameters
job.job_parameters.preheating_temperatur_in_dg_c = 200.0
job.job_parameters.shielding_gas_directions.extend([1.0, 0.0])  # X direction

# Define marking parameters (key 0)
marking_params = job.marking_params_map[0]
marking_params.laser_power_in_w = 280.0
marking_params.laser_speed_in_mm_per_s = 800.0
marking_params.jump_speed_in_mm_s = 5000.0
```

--------------------------------

### Create Build Processor Strategy for 316L Steel

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

This Python example shows how to create a BuildProcessorStrategy for 316L steel, defining parameter sets for both in-skin contours and hatches with specific marking and process parameters.

```python
import build_processor_strategy_pb2 as bps

strategy = bps.BuildProcessorStrategy()
strategy.build_processor_strategy_id = "316L_Standard_v1"
strategy.material_id = "MAT_316L_001"
strategy.name = "316L Standard Parameters"
strategy.material_name = "316L Stainless Steel"

# Parameter set for in-skin contours
contour_set = strategy.parameter_sets.add()
contour_set.lpbf_meta_data.part_area = ovf.VectorBlock.CONTOUR
contour_set.lpbf_meta_data.skin_type = ovf.VectorBlock.LPBFMetadata.IN_SKIN
contour_set.marking_params.laser_power_in_w = 150.0
contour_set.marking_params.laser_speed_in_mm_per_s = 400.0
contour_set.process_strategy.number_of_contours = 2

# Parameter set for in-skin hatches
hatch_set = strategy.parameter_sets.add()
hatch_set.lpbf_meta_data.part_area = ovf.VectorBlock.VOLUME
hatch_set.lpbf_meta_data.skin_type = ovf.VectorBlock.LPBFMetadata.IN_SKIN
hatch_set.marking_params.laser_power_in_w = 280.0
hatch_set.marking_params.laser_speed_in_mm_per_s = 1000.0
hatch_set.process_strategy.hatch_distance_in_mm = 0.12
hatch_set.process_strategy.hatching_pattern = ovf.Part.ProcessStrategy.CHECKERBOARD
```

--------------------------------

### Create a WorkPlane in Python

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

Example of creating a WorkPlane object in Python. Demonstrates setting its Z position, work plane number, number of blocks, and metadata including bounds.

```python
# Example: Creating a WorkPlane for layer 50 at 2.5mm height
work_plane = ovf.WorkPlane()
work_plane.z_pos_in_mm = 2.5  # Layer height
work_plane.work_plane_number = 50
work_plane.num_blocks = 4

# Set metadata for the workplane
work_plane.meta_data.total_scan_distance_in_mm = 15420.5
work_plane.meta_data.total_jump_distance_in_mm = 3200.0
work_plane.meta_data.Bounds.x_min = -50.0
work_plane.meta_data.Bounds.y_min = -50.0
work_plane.meta_data.Bounds.x_max = 50.0
work_plane.meta_data.Bounds.y_max = 50.0
```

--------------------------------

### Create a Contour using LineSequence in Python

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

Example of creating a VectorBlock for a contour using LineSequence in Python. This is a basic setup for defining vector data.

```python
# Example: Creating a contour using LineSequence
contour_block = ovf.VectorBlock()
```

--------------------------------

### OVF File Structure Overview

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

This outlines the sequential structure of an OVF file, starting with a magic number, followed by LUT positions, VectorBlocks, WorkPlaneShells, and finally the JobShell and JobLUT.

```text
[Magic Number: 4 bytes] [0x4c, 0x56, 0x46, 0x21]
[Job LUT Position: 8 bytes Int64 LE]
[WorkPlane 0 LUT Position: 8 bytes]
[VectorBlock 0.0] [VectorBlock 0.1] ... [WorkPlaneShell 0] [WorkPlaneLUT 0]
[WorkPlane 1 LUT Position: 8 bytes]
[VectorBlock 1.0] [VectorBlock 1.1] ... [WorkPlaneShell 1] [WorkPlaneLUT 1]
...
[JobShell]
[JobLUT]
```

--------------------------------

### Create Hatch Lines for Volume Filling

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

Generates hatch lines for filling a volume. The points define start and end coordinates for each parallel hatch line.

```python
hatch_block = ovf.VectorBlock()
# Hatches as [start_x1, start_y1, end_x1, end_y1, start_x2, start_y2, ...]
hatch_block._hatches.points.extend([
    1.0, 1.0, 9.0, 1.0,   # Hatch line 1
    1.0, 2.0, 9.0, 2.0,   # Hatch line 2
    1.0, 3.0, 9.0, 3.0,   # Hatch line 3
])
hatch_block.marking_params_key = 1
```

--------------------------------

### BuildProcessorStrategy Protobuf Definition

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

This Protobuf message defines the structure for BuildProcessorStrategy, which includes parameters for build processors that convert slicer output to OVF files.

```protobuf
message BuildProcessorStrategy {
  string build_processor_strategy_id = 1;
  string material_id = 2;
  string name = 3;
  string material_name = 4;
  repeated ParameterSet parameter_sets = 5;

  message ParameterSet {
    VectorBlock.LPBFMetadata lpbf_meta_data = 1;
    Part.ProcessStrategy process_strategy = 2;
    MarkingParams marking_params = 3;
  }
}
```

--------------------------------

### Configure Down-Skin Parameter Set

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

Sets parameters for a down-skin strategy, reducing power for overhangs. Requires `ovf.VectorBlock` and `strategy.parameter_sets.add()`.

```python
downskin_set = strategy.parameter_sets.add()
downskin_set.lpbf_meta_data.part_area = ovf.VectorBlock.VOLUME
downskin_set.lpbf_meta_data.skin_type = ovf.VectorBlock.LPBFMetadata.DOWN_SKIN
downskin_set.marking_params.laser_power_in_w = 180.0
downskin_set.marking_params.laser_speed_in_mm_per_s = 600.0
downskin_set.process_strategy.hatch_distance_in_mm = 0.08
```

--------------------------------

### Configure High-Speed Hatching with Skywriting

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

Configures marking parameters for high-speed hatching, enabling skywriting for acceleration compensation. Sets higher power and speed, and uses SKYWRITING_LOOKAHEAD mode.

```python
hatch_params = job.marking_params_map[1]
hatch_params.name = "Hatch_316L_Fast"
hatch_params.laser_power_in_w = 280.0
hatch_params.laser_speed_in_mm_per_s = 1200.0
hatch_params.marking_mode = ovf.MarkingParams.SKYWRITING_LOOKAHEAD
hatch_params.corner_tolerance = 0.05  # 50 micron tolerance
hatch_params.minimum_mark_speed = 800.0
```

--------------------------------

### Define Part with Full Process Strategy

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

Defines a part with its name, geometry, material, and a comprehensive in-skin process strategy. Includes layer thickness, hatch distance, contour settings, and hatching pattern.

```python
part = job.parts_map[0]
part.name = "Bracket_Assembly_001"
part.parent_part_name = "Bracket_Template"

# Geometry metadata
part.geometry_info.volume_in_mm3 = 1250.5
part.geometry_info.support_volume_in_mm3 = 320.0
part.geometry_info.build_height_in_mm = 45.0
part.geometry_info.surface_area_in_mm2 = 4800.0

# Material
part.material.id = 1
part.material.name = "316L Stainless Steel"

# In-skin (volume) process strategy
strategy = part.process_strategy
strategy.name = "Standard_316L"
strategy.layer_thickness_in_mm = 0.05
strategy.hatch_distance_in_mm = 0.12
strategy.hatch_contour_distance_in_mm = 0.08
strategy.number_of_contours = 2
strategy.contour_distance_in_mm = 0.1
strategy.contour_offset_in_mm = 0.05
strategy.hatching_pattern = ovf.Part.ProcessStrategy.CHECKERBOARD
strategy.pattern_hatch_length_in_mm = 5.0
strategy.rot_angle_in_deg = 0.0
strategy.increment_angle_in_deg = 67.0  # Rotation between layers
```

--------------------------------

### Configure Marking Parameters for LPBF Contours

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

Sets up standard marking parameters for LPBF contours, including laser power, speed, and basic delay settings. Uses NO_SKY marking mode.

```python
contour_params = job.marking_params_map[0]
contour_params.name = "Contour_316L"
contour_params.laser_power_in_w = 150.0
contour_params.laser_speed_in_mm_per_s = 400.0
contour_params.jump_speed_in_mm_s = 5000.0
contour_params.laser_focus_shift_in_mm = 0.0

# Standard delay parameters
contour_params.marking_mode = ovf.MarkingParams.NO_SKY
contour_params.jump_delay_in_us = 100.0
contour_params.laser_on_delay_in_us = 50.0
contour_params.laser_off_delay_in_us = 50.0
contour_params.mark_delay_in_us = 50.0
contour_params.polygon_delay_in_us = 100.0
```

--------------------------------

### Add Hatch for Volume Filling

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

This snippet demonstrates how to add a hatch for volume filling in a work plane, specifying its points, marking parameters, and LPBF metadata.

```python
hatch = work_plane.vector_blocks.add()
hatch._hatches.points.extend([1, 1, 9, 1, 1, 2, 9, 2, 1, 3, 9, 3])
hatch.marking_params_key = 1
hatch.lpbf_metadata.part_area = ovf.VectorBlock.VOLUME
hatch.lpbf_metadata.skin_type = ovf.VectorBlock.LPBFMetadata.IN_SKIN
hatch.lpbf_metadata.structure_type = ovf.VectorBlock.PART
```

--------------------------------

### Read Specific WorkPlane using LUTs (Pseudocode)

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

This pseudocode illustrates the process of reading a specific WorkPlane from an OVF file by utilizing the Job and WorkPlane LUTs to locate and parse the required data.

```csharp
// 1. Read magic number and Job LUT position from file header
// 2. Seek to JobLUT position and parse JobLUT
// 3. Get WorkPlane N position from jobLUT.workPlanePositions[N]
// 4. Read Int64 at that position to get WorkPlaneLUT position
// 5. Parse WorkPlaneLUT for VectorBlock positions
// 6. Selectively read required VectorBlocks
```

--------------------------------

### Define Synchronization Block for Laser Coordination

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

Specifies a block index that a laser unit must wait for, enabling synchronization between multiple laser units. Used within `SynchronizationBlock` context.

```protobuf
message SynchronizationBlock {
  int32 vector_block_index_to_wait_on = 1;  // Block index to wait for
}
```

--------------------------------

### Protobuf Message Definitions for OVF

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

These Protobuf messages define the structure for Job and WorkPlane look-up tables (LUTs), enabling efficient navigation and selective loading of OVF file data.

```protobuf
message JobLUT {
  int64 jobShellPosition = 1;
  repeated int64 workPlanePositions = 2;
}

message WorkPlaneLUT {
  int64 workPlaneShellPosition = 1;
  repeated int64 vectorBlocksPositions = 2;
}
```

--------------------------------

### Define Exposure Pause for Multi-Laser Systems

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

Defines a static wait time in microseconds for thermal management in multi-laser systems. Used within `SynchronizationBlock` context.

```protobuf
message ExposurePause {
  uint64 pause_in_us = 1;  // Static wait time
}
```

--------------------------------

### Define Job Message Structure in Protobuf

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

Defines the root Job message structure for a complete production job, including work planes, metadata, marking parameters, parts, and job-level parameters.

```protobuf
message Job {
  repeated WorkPlane work_planes = 1;
  JobMetaData job_meta_data = 2;
  map<int32, MarkingParams> marking_params_map = 3;
  map<int32, Part> parts_map = 4;
  JobParameters job_parameters = 5;
  int32 num_work_planes = 6;
}
```

--------------------------------

### Add Down-Skin Hatches

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

This code adds down-skin hatches, which are the first layers over powder. It uses a different marking parameters key and specifies down-skin metadata.

```python
downskin_hatch = work_plane.vector_blocks.add()
downskin_hatch._hatches.points.extend([1, 5, 9, 5, 1, 6, 9, 6])
downskin_hatch.marking_params_key = 2  # Different params for down-skin
downskin_hatch.lpbf_metadata.part_area = ovf.VectorBlock.VOLUME
downskin_hatch.lpbf_metadata.skin_type = ovf.VectorBlock.LPBFMetadata.DOWN_SKIN
```

--------------------------------

### Create Contour Vector Block with LPBF Metadata

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

Creates a contour vector block and assigns LPBF-specific metadata, including part area classification, skin type, and structure type. Associates it with a part key.

```python
# Contour block for part boundary
contour = work_plane.vector_blocks.add()
contour.line_sequence.points.extend([0, 0, 10, 0, 10, 10, 0, 10, 0, 0])
contour.marking_params_key = 0
contour.lpbf_metadata.part_area = ovf.VectorBlock.CONTOUR
contour.lpbf_metadata.skin_type = ovf.VectorBlock.LPBFMetadata.IN_SKIN
contour.lpbf_metadata.structure_type = ovf.VectorBlock.PART
contour.meta_data.part_key = 0
```

--------------------------------

### Write Delimited Protobuf Message

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

This Python function serializes a protobuf message and writes it to a file in a length-delimited format, which is useful for streaming or inter-process communication.

```python
from google.protobuf.internal.encoder import _VarintBytes
from google.protobuf.internal.decoder import _DecodeVarint32

def write_delimited(file, message):
    """Write a length-delimited protobuf message"""
    serialized = message.SerializeToString()
    file.write(_VarintBytes(len(serialized)))
    file.write(serialized)
```

--------------------------------

### Define WorkPlane Message Structure in Protobuf

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

Defines the WorkPlane message structure, representing a 2D working plane in 3D space with position, orientation, and vector block information.

```protobuf
message WorkPlane {
  repeated VectorBlock vector_blocks = 1;
  float x_pos_in_mm = 2;
  float y_pos_in_mm = 3;
  float z_pos_in_mm = 4;  // Build plate position for LPBF
  float x_rot_in_deg = 5;
  float y_rot_in_deg = 6;
  float z_rot_in_deg = 7;
  int32 num_blocks = 8;
  uint32 repeats = 9;
  int32 work_plane_number = 10;
}
```

--------------------------------

### Define VectorBlock Message Structure in Protobuf

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

Defines the VectorBlock message structure, which can contain various types of vector data such as LineSequence, Hatches, Arcs, and Bézier curves, along with associated parameters.

```protobuf
message VectorBlock {
  oneof vector_data {
    LineSequence line_sequence = 1;      // Connected line segments
    Hatches _hatches = 2;                // Independent hatch lines
    PointSequence point_sequence = 3;    // Point-by-point exposure
    Arcs _arcs = 4;                      // Circular arcs
    Ellipses ellipses = 5;               // Elliptical curves
    LineSequence3D line_sequence_3d = 6;
    Hatches3D hatches_3d = 7;
    ExposurePause exposure_pause = 10;
    LineSequenceParaAdapt line_sequence_para_adapt = 11;
    CubicBezierHatches cubic_bezier_hatches = 13;
    QuadraticBezierSpline quadratic_bezier_spline = 16;
    SynchronizationBlock sync_block = 21;
  }
  int32 marking_params_key = 50;
  int32 laser_index = 53;  // For multi-laser systems
  uint64 repeats = 54;
}
```

--------------------------------

### Read Delimited Protobuf Message

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

This Python function reads a length-delimited protobuf message from a file, deserializing it into the specified message type. It handles variable-length encoding for message size.

```python
from google.protobuf.internal.encoder import _VarintBytes
from google.protobuf.internal.decoder import _DecodeVarint32

def read_delimited(file, message_type):
    """Read a length-delimited protobuf message"""
    buf = file.read(10)  # Max varint size
    msg_len, new_pos = _DecodeVarint32(buf, 0)
    file.seek(file.tell() - 10 + new_pos)
    msg_buf = file.read(msg_len)
    return message_type.FromString(msg_buf)
```

--------------------------------

### Define Closed Square Contour

Source: https://context7.com/digital-production-aachen/openvectorformat/llms.txt

Defines a closed square contour using a sequence of points. Ensure the last point matches the first to close the contour.

```python
contour_block.line_sequence.points.extend([
    0.0, 0.0,    # Point 1
    10.0, 0.0,   # Point 2
    10.0, 10.0,  # Point 3
    0.0, 10.0,   # Point 4
    0.0, 0.0     # Close contour
])
contour_block.marking_params_key = 0  # Reference to marking params
contour_block.laser_index = 0
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.