I'm trying to implement slow-mo...

nsto119 · 2005-11-27T10:02:36

So, I've got an vertically scrolling shooter in SDL (original, I know), and I'm looking to add a slo-mo bullet time type of effect. So, when the player enters bullet time, the screen goes black and white (not greyscale), a motion-blur is added, and (obviously) time slows down. The first two were easy to implement, but I'm having trouble with the slow motion. In the Engine class, I have a timer object, and any object that requires time-based movement or animation is passed a pointer to the timer when they get constructed - this way our objects can be in-sync and don't get messed up when the game is paused. I've added this code to the Timer class's GetTicks() function to attempt to implement slow-mo: else if( m_bSloMo ) { int t = ( SDL_GetTicks() - m_iStartTicks - m_iSloMoTicks ) / 4; return m_iSloMoTicks + t; } where m_iSloMoTicks is initialized to this->GetTicks() when slomo is activated. The logic all works out in my head but it just doesn't do anything when I activate it in game... anybody see any flas in my code?

For Beginners

Started by nsto119 November 26, 2005 08:16 PM

11 comments, last by Iftah 18 years, 5 months ago

Anonymous

November 27, 2005 09:41 AM

cool i can't wait to see it, i love vert shooters.

I'm guessing it was influenced by ESPgaluda?

AAAP

137

November 27, 2005 09:42 AM

dahhh ^--- was me, always forget to login. just PM me if you get a demo out soon, I got a domain recently so I could even host it for you if you want

[Edited by - AAAP on November 27, 2005 8:42:05 PM]

|aaap.penopticon.com| My website, including game projects. Collaboration/comments are welcome, please visit :)

Iftah

413

November 27, 2005 10:02 AM

i think the problem you experienced with the chopiness results from the integer rounding down the result.

say time diff is 7 it rounds down to 7/4 = 1
and if the time diff is 3 it rounds down to 0

you can change it to float, or if you want to keep everything int, you can keep the reminder of the result in another var, and add it to the calculation in the next time its called. (so 7/4 will return 1, but next time it will be (7+3)/4=2, next time it will be (7+1)/4)

if you call your method more than once per frame you can have very small time diff. even at only once per frame the error is too big to my likings.

Iftah.

I'm trying to implement slow-mo...

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