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What is the difference between Progressive and 'default' rendering?

sebastian.friston_f34eb580c1sebastian.friston_f34eb580c1 Posts: 34
edited December 1969 in Daz Studio Discussion

Hello,

This is more of a 3Delight question, but technically, what is the difference between progressive and 'regular' rendering?

I can see differences in the final image (e.g. some shadows are grainy when using progressive, and it is much faster), but what exactly is the renderer doing differently?

Comments

  • Richard HaseltineRichard Haseltine Posts: 102,374
    edited December 1969

    Progressive does a crude pass of the whole image, then goes back and refines it, then refines that, until it hist the final state. Standard render just goes straight to the final quality settings. That means progressive is good for a quick check of the whole image, but is a very inefficient way to render the final image.

  • sebastian.friston_f34eb580c1sebastian.friston_f34eb580c1 Posts: 34
    edited December 1969

    Hi Richard,

    Thank you!

    So it just distributes the sampling/rays differently? That implies that if it were to be left long enough it would converge on the same image as would be created rendering individual buckets/tiles, is there an option in 3Delight to say when the progressive render is considered 'complete'?

  • Richard HaseltineRichard Haseltine Posts: 102,374
    edited December 1969

    Yes, it will converge - it's just doing every nth row and column, then going back and filling in the midpoints, then the midpoints between those, and it stops when it's done the same numbers as a direct render would have.

  • KeryaKerya Posts: 10,943
    edited December 1969

    And I am not sure the memory leak on progressive ist stopped ... so if you don't have much RAM a progressive render may crash where a normal render does not.

  • wizwiz Posts: 1,100
    edited December 1969

    Weirdest thing is, you keep hearing people say to turn off progressive if you have crashes. Turning progressive on really cut down on my crashes

    Studio 4.6 64 bit, 64 gigs ram, Windows 7 64 bit

  • Jim_1831252Jim_1831252 Posts: 728
    edited December 1969

    I've been using it a lot lately and I haven't had any memory issues. I tend to work with smaller scenes though.

    Even though progressive changes to a box filter it seems to take a lot longer to render the same image than if you use the standard render method. Very useful for quickly checking lights and materials though, especially with spot render.

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