uvj

package
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 Go to latest Published: Feb 20, 2022 License: MIT Imports: 12 Imported by: 0

README

UVJ File Format

Introduction

The 'UVJ' file format is a vendor-neutral file format for UV curing resin 3D printers, that use a parallel pixel UV light source (ie LCD masking or DLP projector).

It is comprised of a configuration JSON file, and a number of MxN image slices, and optional thumbnail preview files. The set of files is wrapped up as a Zip file archive.

ZIP Directory Layout

Path Comments
config.json Configuration JSON file
slice/ Image slice directory (PNG file format, 8-bit greyscale)
slice/00000000.png First slice of the object
slice/????????.png Nth slice of the object (???????? is the printf format %08d of the slice index)
preview/ Thumbnail previews (PNG file format, 8bit/color RGB)
preview/huge.png Large preview
preview/tiny.png Small preview

Configuration file

The configuration file is named config.json, and is in the JSON syntax.

Top level groups are as follows (required fields are in bold ):

Field Comment
Properties Group of properties for the configuration
Layers Optional array of LayerSetting to override per-layer exposure settings
Properties
Field Comment
Size Group of size definitions for the configuration
Exposure Nominal exposure settings
Bottom Bottom exposure layer count and default exposure settings
Size
Field Comment
X Size of the X dimension, in pixels
Y Size of the Y dimension, in pixels
Millimeter.X Size of the X dimension, in millimeters
Millimeter.Y Size of the Y dimension, in millimeters
Layers Total number of slices to print
LayerHeight Nominal height per-layer, in mm
Exposure
Field Comment
LightOnTime Duration of the UV exposure, in seconds
LightOffTime Amount of time for the light to be off before lift & retract, in seconds
LightPWM PWM (intentity) setting, from 1..255. If not present, the default is 255 (full intensity)
LiftHeight Height to raise for lift/peel move in Z, in millimeters
LiftSpeed Speed for lift/peel move in millimeters/minute
RetractHeight Retraction height, after lift/peel move, in millimeters
RetractSPeed Retraction speed, in millimeters/minute
Bottom
Field Comment
Count Number of bottom layers to apply the bottom exposure settings
LightOnTime Duration of the UV exposure, in seconds
LightOffTime Amount of time for the light to be off before lift & retract, in seconds
LightPWM PWM (intentity) setting, from 1..255. If not present, the default is 255 (full intensity)
LiftHeight Height to raise for lift/peel move in Z, in millimeters
LiftSpeed Speed for lift/peel move in millimeters/minute
RetractHeight Retraction height, after lift/peel move, in millimeters
RetractSPeed Retraction speed, in millimeters/minute
LayerSetting
  • This array of per-layer overrides must be either empty, or have Properties.Size.Layers entries.
  • All entries must be in increasing Z order.
Field Comment
Z Height in Z to move for this layer
Exposure Per-layer exposure override

Worked Example A

This example is for a 1440x2560 pixel LCD printer, printing 432 layers at 0.05mm/layer.

The bottom exposure is set for 60 seconds, at 4 layers.

The nominal exposure is set for 11.5 seconds.

No per-layer overrides are set.

config.json
{
  "Properties": {
    "Size": {
      "X": 1440,
      "Y": 2560,
      "Millimeter": {
        "X": 72.0,
        "Y": 128.0
      },
      "Layers": 432,
      "LayerHeight": 0.05
    },
    "Exposure": {
      "LightOnTime": 11.5,
      "LightOffTime": 3,
      "LiftHeight": 5.5,
      "LiftSpeed": 120,
      "RetractHeight": 4,
      "RetractSpeed": 200
    },
    "Bottom": {
      "LightOnTime": 60,
      "LightOffTime": 3,
      "LiftHeight": 6,
      "LiftSpeed": 50,
      "RetractHeight": 4,
      "RetractSpeed": 200,
      "Count": 4
    }
  }
}

Worked Example B (with per-layer overrides)

This example is for a 1080x1920 pixel LCD printer, printing 14 layers at 0.1mm/layer.

The bottom exposure is set for 25 seconds, at 4 layers.

The nominal exposure is set for 3.1 seconds.

Per-layer overrides are set, specifically Layer 2's exposure it set for 20s.

config.json
{
  "Properties": {
    "Size": {
      "X": 1080,
      "Y": 1920,
      "Millimeter": {
        "X": 68.04,
        "Y": 120.96
      },
      "Layers": 14,
      "LayerHeight": 0.1
    },
    "Exposure": {
      "LightOnTime": 3.1,
      "LightOffTime": 6,
      "LiftHeight": 5,
      "LiftSpeed": 100,
      "RetractHeight": 6,
      "RetractSpeed": 200
    },
    "Bottom": {
      "LightOnTime": 25,
      "LightOffTime": 6,
      "LiftHeight": 10,
      "LiftSpeed": 60,
      "RetractHeight": 6,
      "RetractSpeed": 200,
      "Count": 2,
    }
  },
  "Layers": [
    {
      "Z": 0,
      "Exposure": {
        "LightOnTime": 25,
      }
    },
    {
      "Z": 0.1,
      "Exposure": {
        "LightOnTime": 20,
      }
    },
    {
      "Z": 0.2,
      "Exposure": {
        "LightOnTime": 3.1,
      }
    },
    {
      "Z": 0.3,
      "Exposure": {
        "LightOnTime": 3.1,
      }
    },
    {
      "Z": 0.4,
      "Exposure": {
        "LightOnTime": 3.1,
      }
    },
    {
      "Z": 0.5,
      "Exposure": {
        "LightOnTime": 3.1,
      }
    },
    {
      "Z": 0.6,
      "Exposure": {
        "LightOnTime": 3.1,
      }
    },
    {
      "Z": 0.7,
      "Exposure": {
        "LightOnTime": 3.1,
        "LightOffTime": 6,
        "LightPWM": 255,
        "LiftHeight": 5,
        "LiftSpeed": 100,
        "RetractHeight": 6,
        "RetractSpeed": 200
      }
    },
    {
      "Z": 0.8,
      "Exposure": {
        "LightOnTime": 3.1,
        "LightOffTime": 6,
        "LightPWM": 255,
        "LiftHeight": 5,
        "LiftSpeed": 100,
        "RetractHeight": 6,
        "RetractSpeed": 200
      }
    },
    {
      "Z": 0.90000004,
      "Exposure": {
        "LightOnTime": 3.1,
        "LightOffTime": 6,
        "LightPWM": 255,
        "LiftHeight": 5,
        "LiftSpeed": 100,
        "RetractHeight": 6,
        "RetractSpeed": 200
      }
    },
    {
      "Z": 1,
      "Exposure": {
        "LightOnTime": 3.1,
        "LightOffTime": 6,
        "LightPWM": 255,
        "LiftHeight": 5,
        "LiftSpeed": 100,
        "RetractHeight": 6,
        "RetractSpeed": 200
      }
    },
    {
      "Z": 1.1,
      "Exposure": {
        "LightOnTime": 3.1,
        "LightOffTime": 6,
        "LightPWM": 255,
        "LiftHeight": 5,
        "LiftSpeed": 100,
        "RetractHeight": 6,
        "RetractSpeed": 200
      }
    },
    {
      "Z": 1.2,
      "Exposure": {
        "LightOnTime": 3.1,
        "LightOffTime": 6,
        "LightPWM": 255,
        "LiftHeight": 5,
        "LiftSpeed": 100,
        "RetractHeight": 6,
        "RetractSpeed": 200
      }
    },
    {
      "Z": 1.3000001,
      "Exposure": {
        "LightOnTime": 3.1,
        "LightOffTime": 6,
        "LightPWM": 255,
        "LiftHeight": 5,
        "LiftSpeed": 100,
        "RetractHeight": 6,
        "RetractSpeed": 200
      }
    }
  ]
}

Documentation

Overview

Package uvj handles input and output of UV3DP 'generic' zip files (JSON slice description and images)

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type ErrConfigInvalid 

type ErrConfigInvalid string

func (ErrConfigInvalid) Error 

func (e ErrConfigInvalid) Error() string

type ErrConfigMissing 

type ErrConfigMissing string

func (ErrConfigMissing) Error 

func (e ErrConfigMissing) Error() string

type UVJ 

type UVJ struct {
	uv3dp.Print
	Layers []UVJLayer
	// contains filtered or unexported fields
}

func (*UVJ) Close 

func (uvj *UVJ) Close()

func (*UVJ) LayerExposure 

func (uvj *UVJ) LayerExposure(index int) (exposure uv3dp.Exposure)

func (*UVJ) LayerImage 

func (uvj *UVJ) LayerImage(index int) (layerImage *image.Gray)

func (*UVJ) LayerZ 

func (uvj *UVJ) LayerZ(index int) (z float32)

type UVJConfig 

type UVJConfig struct {
	Properties uv3dp.Properties
	Layers     []UVJLayer
}

type UVJFormat 

type UVJFormat struct {
	*pflag.FlagSet
}

func NewUVJFormatter 

func NewUVJFormatter(suffix string) (sf *UVJFormat)

func (*UVJFormat) Decode 

func (sf *UVJFormat) Decode(reader uv3dp.Reader, filesize int64) (printable uv3dp.Printable, err error)

func (*UVJFormat) Encode 

func (sf *UVJFormat) Encode(writer uv3dp.Writer, printable uv3dp.Printable) (err error)

type UVJLayer 

type UVJLayer struct {
	Z        float32
	Exposure uv3dp.Exposure
}

Source Files

View all Source files

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