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How to set diffuse, specular lighting in pptx 3d models

Sridharan Arumugam 20 Reputation points
2023-12-21T05:10:43.25+00:00

I have embedded glb file in pptx file. I have my own lighting values and I want to set it to glb model.

In slide[n].xml, I found nodes 'am3d:ambientLight' and '<am3d:ptLight rad="0">' which sets the lighting.

The lighting data which I have has specular and diffuse information. How to set those information ?

I have attached point-light and ambient-light information image below.

lights

Also, how these RGB values are determined ? My understanding is, it ranges from 0 to 255.

Also, it looks like x, y, z values are affected by some scale-factor. How to compute the scale factor and it's impact on x,y,z values.

Microsoft 365
Microsoft 365
Formerly Office 365, is a line of subscription services offered by Microsoft which adds to and includes the Microsoft Office product line.
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PowerPoint
PowerPoint
A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
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Office Development
Office: A suite of Microsoft productivity software that supports common business tasks, including word processing, email, presentations, and data management and analysis.Development: The process of researching, productizing, and refining new or existing technologies.
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Accepted answer
  1. John Korchok 5,121 Reputation points
    2023-12-26T18:36:41.9533333+00:00

    Here's my article explaining how to edit the lighting controls in OOXML. This applies both to 3D models and to 3D shapes in PowerPoint, Word and Excel.

    https://www.brandwares.com/bestpractices/2023/12/ooxml-hacking-lighting-controls-for-3d/

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