Tiled OpenEXR files
Tiled texture options
The VRayHDRI map can be used to load high dynamic range images (HDRI) and map them onto the environment. Supports most of the standard HDRI-environment mapping methods. Since V-Ray 2.0, this texture can also be used to load other file formats.
Since V-Ray 2.0, this texture can also be used to load efficiently tiled OpenEXR files. Tiled OpenEXR files allow only portions of the textures to be loaded at various resolutions. This allows V-Ray to only load those parts of the textures that are needed for the rendering.
You can convert many common image file formats to tiled OpenEXR files using the img2tiledexr tools.
Bitmap - the file name from which the bitmap is loaded. Currently supported formats are HDR, EXR, PNG, BMP, TGA, SGI, JPG, PIC, TIF, PSD, VRIMG. Image file lists in the form of IFL files are also supported.
- click this button to browse for an HDR image.
These parameters determine how the VRayHDRI texture is mapped.
Mapping type - the following mapping types are supported:
- Angular - environment mapping in angular mode;
- Cubic - environment mapping in cubic mode;
- Spherical - environment mapping in spherical mode;
- Mirrored ball - environment mapping in mirror ball mode;
- 3ds Max standard - the mapping type is determined by the Coordinates section.
Horiz. rotation - allows rotation of the environment map left and right. Ignored when the Mapping type is 3ds Max standard.
Flip horizontally - flips the environment horizontally. Ignored when the Mapping type is 3ds Max standard.
Vert. rotation - allows rotation of the environment map up and down. Ignored when the Mapping type is 3ds Max standard.
Flip vertically - flips the environment vertically. Ignored when the Mapping type is 3ds Max standard.
Overall multiplier - a control for the overall brightness of the image. This multiplier affects both rendering and the material editor.
Render multiplier - controls the brightness of the HDRI image only when rendering; it has no effect on the display of the image in the material editor.
Interpolation - determines how the image is interpolated from the pixel values. See the Examples for a demonstration of this effect. Possible values are:
- Bilinear - the image values are interpolated from four pixels in the bitmap. This is the fastest interpolation method, but the result is not continuous (non-smooth) and may produce artifacts when the map is used for displacement or bump mapping.
- Bicubic - the image values are interpolated from sixteen pixels in the bitmap. This is the slowest method, but the results are smooth without too much blur;
- Biquadratic - the image values are interpolated from nine pixels in the bitmap. This method is faster than the Bicubic interpolation, but may smooth the image too much.
- Default - the interpolation type is chosen automatically depending on the bitmap format to match the behavior of the standard 3ds Max Bitmap texture. For HDR and EXR images, the interpolation is Bilinear, and for all other formats - Bicubic.
The controls in this group let you crop the texture or reduce its size for custom placement. Cropping a texture means to reduce it to a smaller rectangular area than it originally had. Cropping doesn't change the scale of the texture.
Placing a texture lets you scale the map and place it anywhere within its tile. Placing can change the texture's scale, but shows the entire texture. The four values that specify the placement and size of the cropping or placement region are all animatable. Cropping and placement settings affect the texture only as it's used for this map and any instances of the map. They have no effect on the texture file itself.
On - Turn on to use the cropping or placement settings.
Crop - enables cropping
Place - enables placing
U/V - Adjusts the texture location - specifies the location of the top left corner of the image.
Width/Height - Adjusts the width and height of the texture or crop area.
Type - this parameter allows the user to manualy specifiy the color space of the .hdr image so that the inverse curve can be applied to make the image in a linear color space
- None - no correction is applied
- Inverse gamma - when this mode is selected the color space is controlled through the Inverse Gamma parameter
- sRGB - the .hdr image is in sRGB color space
- From 3ds Max - the gamma is controlled from 3ds Max (customize -> preferences -> Gamma and LUT -> Input Gamma)
Inverse Gamma - a gamma-correction value for the image. For example, if the bitmap was saved to
disk with a 2.2 gamma correction, you need to enter 0.4545 to remove that correction for the rendering.
These options are shared between all instances of the VRayHDRI texture; changing them in one texture affects all other textures.
Tiled texture cache size - the size of the cache for tiled OpenEXR files, in megabytes. When the texture cache is full, part of the tiles will be flushed to make space for loading new tiles as needed.
Clear cache on render end - if enabled, the texture cache is flushed at the end of each frame. This may save some RAM, but will cause the texture tiles to be reloaded on each frame.
The options in this rollout allow the user to control the playback options when a sequence of textures is loaded.
Start frame - this parameter allows the user to offset the beginning of the animation by given number of frames
Playback Rate - this is a multiplier for the speed of the animation.
End coditions - this parameter specifies the playback mode of the animation - i.e. what will happen when the final frame of the sequence is reached
- Loop - the animation is looped by skipping to the first frame once it has finished
- Ping pong - the animation is looped by playing it backwards once the last frame has been reached and then playing it forward again when the first frame is reached
- Hold - the animation is played just once
These parameters are used when the Mapping type is set to 3ds Max standard. They are the regular 3ds Max mapping parameters as found in the standard 3ds Max Bitmap texture.