Houdini Python - 06 Arnold Look-dev HDA Part - II

Part - 2 'Set Turntable'

Brief Thought:

"As the main feature of Turntable is rotation of Camera and Light, so we will go through in thoroughly with the method which will be easy and accurate to follow. The isolation for rotation of Camera or Light is a feature which needs to have hands on expressions and lastly will check with setting the frame range and constraining it seamlessly between rotation of camera/lights."

Set Turntable Section:

Set Turntable Widget

Details :

• Isolate Turntable - an option between only light and only camera rotation, if nothing is pressed than default look-dev rotation. This contains expression logic.

• Turntable Range - input for first and last frame to set file's frame range to render.

Dive in Deep :

The hscript expression which helped to animate and rotate light and camera :

fit( $F, start_frame, end_frame, 0, 360)

1. Expression Purpose: The expression serves the purpose of mapping the current frame ($F) to a value between 0 and 360. This mapping allows for smooth rotation animations of lights and cameras.
   

2. Understanding the Parameters: a) $F: Represents the current frame in the animation. b) start_frame and end_frame: Define the range of frames over which the animation occurs. c) 0 and 360: Define the range of values to which $F will be mapped. In this case, 0 corresponds to 0 degrees of rotation, and 360 corresponds to a full rotation of 360 degrees.
   

3. How It Works: a) At the start_frame, the value of $F is mapped to 0, resulting in no rotation. b) As the animation progresses from start_frame to end_frame, the value of $F increases linearly within this range. c) Consequently, the mapped value also increases linearly from 0 to 360, creating a smooth rotation effect. d) By the time the animation reaches end_frame, the mapped value of $F is 360, indicating a full rotation.
   

4. Example: a) Let's say start_frame = 1001 and end_frame = 1050. b) When the current frame ($F) is 1001, the mapped value will be 0 degrees (no rotation). c) As the animation progresses, the mapped value increases linearly. d) At frame 1050, the mapped value will be 360 degrees, indicating a complete rotation.

This hscript expression provides a convenient way to animate rotations smoothly within a specified range of frames. Follow along by downloading the content, link provided below.

>>>>> DOWNLOAD <<<<<

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