Previzion Manual

Frequently Asked Questions

Creating Sync From HDSDI

This converter takes in a standard 4:2:2 HDSDI signal, and does a D-A conversion on it. It also passes the original HDSDI digital signal out untouched, and we then connect this output to the Previzion HDSDI video input. The D-A conversion results in a Y”CbCr analog HD video signal, along with a pure HD genlock output. This HD genlock is what we then route to the Airtrack genlock input, and it works pretty well.

This basically depends on there being a very short delay between the point where the camera triggers the sensor, and when the resulting frame comes out the camera”s HDSDI port. In practice, it actually works pretty well. If you really yanked the camera around, you might see a tiny temporal lag between the virtual background and live video, but in practice it almost never happens, and it makes connecting to an existing camera much, much easier. Some cameras, like the Arri D21, don”t have a genlock input, so this is the only way to sync to these cameras.

Some cameras that have a 2:3 pulldown in their output (The RED, the Varicam, etc.) require the use of an external genlock sign

Previzion Checklists

Prep & Pre-Production

• Stage Survey ……………………………………………………………………………………………………… 3-5Hrs
• Lens Calibration ………………………………………………………………………………………………….. 3Hr/Zoom Lens
• Optimizing 3D Assets …………………………………………………………………………………………….. less than 1Hr

Production & Principal Photography

• Encoded Crane …………………

Previzion Training

The Class

The Previzion training classes are open forum discussions and demonstrations of a variety of topics including new product features, best procedural practices for operation, and how to use Lightcraft’s additional pipeline tools to further reduce task redundancy on set. Classes last from 2- 4 hours depending on the complexity of the material being covered. Over the past few months, our classes have also been a way for clients of our clients to understand how our system works and therefore how they data, they are receiving, is generated and best managed. The class is open to anyone with an interest in the Previzion system. The free classes are held bi-weekly at the new Universal Virtual Stage 1 (UVS1) at Universal Studios.

Curriculum

The courses are taught chronologically in a typical order of operations for Previzion production use:

• Stage Preparation: setting up and planning target placement; surveying a stage; building a Previzion-ready camera rig from scratch; preparing all the software settings and optics to prepare for stage days
• Production Settings: capturing takes; keying; color

Downloads

Portable Target Survey Converter

• Download Latest Version 48.33 KB - modified on 01/25/12
• Info About Using Portable Target Survey Converter
• Info About Using Portable Targets

Wireframe.cgfx Shader

• Download Latest Version 2.47 KB - modified on 08/16/11
• More Info

Unified.cgfx Shader

• Download Latest Version 17.78 KB - modified on 09/06/11
• More Info

KnockOut.cgfx Shader

• Download Latest Version 3.91 KB - modified on 02/13/12
• More Info

Previzion Export Checker

• Download Latest Version 18.71 KB - modified on 02/21/12
• More Info

Texture Repathing Utility

• Download Latest Version 15.08 KB - modified on 02/20/12
• More Info

CGFX Repathing Utility

• Download Latest Version 14.14 KB - modified on 02/20/12

CGFX Shader Swap Utility

• Download Latest Version 18.65 KB - modified on 02/22/12
• More Info

Import Bundler Data into Maya Tool

• For the latest Bun