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Where is the ground texture located?

Those ThingsThose Things Posts: 1,134
in Technical Help (nuts n bolts)

There is a "Ground Texture Scale" slider in the Iray render settings panel. I presume it changes the scale of the ground texture, like it says, but where is the ground texture located? How do I change it?

Comments

  • nemesis10nemesis10 Posts: 3,500
    Those Things said:

    There is a "Ground Texture Scale" slider in the Iray render settings panel. I presume it changes the scale of the ground texture, like it says, but where is the ground texture located? How do I change it?

    It adjusts the "bottom"  of where the shadows would be and/or the bottom of the HDRI  so there really isn't a separate ground texture.  Some artist creat a ground plaine and textutre that and ofset it from the ground bit a tiny amount.

  • Those ThingsThose Things Posts: 1,134
    nemesis10 said:
    Those Things said:

    There is a "Ground Texture Scale" slider in the Iray render settings panel. I presume it changes the scale of the ground texture, like it says, but where is the ground texture located? How do I change it?

    It adjusts the "bottom"  of where the shadows would be and/or the bottom of the HDRI  so there really isn't a separate ground texture.  Some artist creat a ground plaine and textutre that and ofset it from the ground bit a tiny amount.

    I don't understand what you mean by, "It adjusts the "bottom" of where the shadows would be and/or the bottom of the HDRI", sorry. Can you clarify?

    As it stands now, this slider appears to do nothing. Even if I load an HDRI dome, and have "draw ground" set, the relationship of my objects to that dome don't change when I move this slider.

  • FishtalesFishtales Posts: 6,162

    As far as I can remember it scales up or down the Iray ground plane the same as the  radius does with the dome. If you have a HDRI which has a curved shape  where the background meets the ground changing the ground scale can help to align them (as can setting the ground to manual). This is from memory and may not be exactly right as I'm not near my computer.

  • Those ThingsThose Things Posts: 1,134
    Fishtales said:

    As far as I can remember it scales up or down the Iray ground plane the same as the  radius does with the dome. If you have a HDRI which has a curved shape  where the background meets the ground changing the ground scale can help to align them (as can setting the ground to manual). This is from memory and may not be exactly right as I'm not near my computer.

    Ah, ok. So, when I'm rendering with "Infinite Sphere with Ground", or "Finite Sphere with Ground" set, this controls the scale of the portion of the HDRI image that is "stretched" across the ground. Brilliant, and thank you!

  • WendyLuvsCatzWendyLuvsCatz Posts: 38,585

    well technically it has a texture, the bottom portion of the environment map.

  • Roman_K2Roman_K2 Posts: 1,252

    What sort of "ground" is required? There are many add-on ground tools/products/objects/techniques.

    I guess I like the idea of Iray "ground" -- for me it's like a black shadow. However "realistic" shadows that follow physical rules and what I consider to be nice-looking shadows are rarely the same thing, and usually not even close. Example: take the Genesis figure - or any standing figure, even the Tarbosaurus! - and a basic standing pose where the figure has one or both arms bent. Put a light over to the side and render; if your luck is anything like mine there's going to be lonnnng finger shadows across the torso that look like something out of Nosferatu! At this point I usually start rendering TWICE - once with the source forearm, hand and fingers blanked out! Then I'll use an image editor (that supports layers) to try and find a balance between the two "extremes" if you will.

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