CODEWITHSUNDEEP
c++mathopenglc++11
Ram
Ram

Reputation: 3133

Smooth transition to standard 3D view orientation

Currently, I have a mechanism to orient the view to standard orientation by modifying the model view matrix.
I would like to enhance the user experience by providing a smooth animation that will take the user from the current view orientation to the standard view orientation with a smooth transition -> (constant rate of change of direction).
The transition should ideally take less than 500 milliseconds.

I have the following already implemented.

I can extract the current view direction and I know the view direction of all standard views.

My questions:

  1. Should the user be allowed to interact and change the view orientation while the transition is in progress. I think yes, but not sure of the behaviour. I do not want the app to freeze irrespective of the state of the system.
  2. How do I maintain constant rate of change of direction with acceleration and deceleration at the start and end respectively.
  3. How should frames be rendered while the transition is in progress (500 ms). Is there an elegant way of doing this in C++11 using std::thread.

Upvotes: 1

Views: 253

Answers (1)

mtsvetkov
mtsvetkov

Reputation: 843

If you are already handling user input while rendering, there shouldn't be a need for a separate thread. If you want the user to still have control just don't let them control the view matrix directly - rather a target view matrix and simply nudge the current view matrix towards the target a part of the way each frame.

This will complicate the smooth acceleration/deceleration though - say, you start out with a small acceleration, build up speed, and then the user moves the camera: do you start again with a low speed, or do you continue with the same? This is a design decision, but I think the controls would feel weird if the speed the view rotated at changed midway. Also - if you have acceleration/deceleration the rate of change wouldn't be constant by definition, so you really need to decide what you want, possibly try both solutions and see if it "feels right" for a lack of a better phrase.

Upvotes: 2

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