system_nvlink_shared.txt

# This nvlink_shared system option file handles multiple settings of the same option, the last one wins!

# There is only one rendering strategy implemented in this renderer which matches the rtigo3 strategy 3:
# 3 = Interactive Multi-GPU rendering into local GPU buffers of roughly 1/activeDevices size.
#     Tiled rendering with tileSize blocks in a checkered pattern evenly distributed to all enabled GPUs.
#     The full image is composited on the first device resp. the OpenGL interop device.
#     The local data from other devices (not full resolution) is copied to that main device and composited by a native CUDA kernel.

# This setting is ignored by the nvlink_shared parser.
strategy 3

# The devicesMask indicates which devices should be used in a 32-bit bitfield.
# The default is 255 which means 8 bits set so all boards in an RTX server.
# The application will only use the boards actually visible.

devicesMask 3

# The arenaSize defines the default allocation size of each Arena in mega bytes.
# Default is 64 MB, minimum possible is 1 MB.

arenaSize 256

# Use different strategies to update the OpenGL display texture.
# The performance effect of interop 2 is only really visible interactive rendering (-m 0) and present 1.
# 0 = Use host buffers to transfer the result into the OpenGL display texture (slowest).
# 1 = Register the texture image with CUDA and copy into the array directly (fewest copies).
# 2 = Register the pixel buffer for direct rendering in single GPU or as staging buffer in multi-GPU (needs more memory than interop 1).
#     Not available with multi-GPU zero copy strategy because the buffer resides in host memory then.
#     For multi-GPU peer access the renderer cannot directly render with peer-to-peer into the OpenGL PBO and needs a separate shared buffer for rendering.

interop 0

# Controls if every rendered image or final tile should be displayed (1) or only once per second (0) to save PCI-E bandwidth.
# 0 = present only once per second (except for the first half second which accumulates)
# 1 = present every rendered image.

present 0

# Controls resource sharing across devices via CUDA peer-to-peer access when possible.
# Bit 0 = Ignored in the nvlink_shared application.
# Bit 1 = Allow texture CUarray or CUmipmappedArray data sharing via P2P (fast) (default on)
# Bit 2 = Allow geometry acceleration and vertex attribute sharing via P2P (slower) (default on)
# Bit 3 = Allow sharing of spherical environment light texture and CDFs (slow) (default off)

peerToPeer 6

# Rendering resolution is independent of the the window client size.
# The display of the texture is centered in the client window.
# If the image fits, the surrounding is black.
# If it's shrunk to fit, the surrounding pixels are dark red.

resolution 512 512

# Multi-GPU strategies which use tile-based workload distribution can set the tile size here. 
# Default is tileSize 8 8 
# Values must be power-of-two and shouldn't be narrower than 8 or smaller than 32 pixels due to the warp size.

tileSize 16 16

# The integer samplesSqrt is the sqrt(samples per pixel). Default is 1.
# The camera samples are distributed with a fixed rotated grid.
# Final frame rendering algorithms need the samples per pixels anyway.

samplesSqrt 16

# Environment light 
# 0 = black, no light.
# 1 = white, not importance sampled.
# 2 = spherical HDR environment map, importance sampled, uses the file specified by envMap

miss 2

# Spherical HDR environment map, only used with "miss 2".
# envMap "<filename>"

envMap "NV_Default_HDR_3000x1500.hdr"

# Spherical environment rotation around up-axis, only used with "miss 2"
# envRotation <float> in range [0.0f, 1.0f]

envRotation 0

# Area light configuration.
# 0 = No area light in the scene.
# 1 = 1x1 meter square light 1.95 meters above the scene to fit in a 2x2x2 box with floor at y = 0 (Cornell Box).
# 2 = 4x4 meter square light 4 meters above the scene.

light 0

# Path lengths minimum and maximum.
# Minimum path length before Russian Roulette kicks in.
# Maximum path length before termination.
# Set min >= max to disable Russian Rouelette.
# pathLengths <int> <int> in range [0, 100]

pathLengths 2 5

# Scene dependent epsilon factor scaled by 1.0e-7.
# The renderer works in meters for the absorption, that means epsilonFactor 1000 is a scene epsilon of 1e-4 which is a thenth of a millimeter.
# Used for cheap self intersection avoidance by changing ray t_min (and t_max for visibility checks)
# epsilonFactor <float> in range [0.0f, 10000.0f] (because of the GUI).

epsilonFactor 500

# Time vizualization clock factor scaled by 1.0e-9.
# Means with 1000 all values >1.0 in the time view output (alpha channel) have taken a million clocks or more.

clockFactor 1000

# Lens shader callable program.
# 0 = pinhole
# 1 = full format fisheye
# 2 = spherical projection

lensShader 0

# Camera center of interest.
# Absolute x, y, z coordinates in scene units (meters)
# This setting is for the scene_nvlink_spheres_5_5_5.txt

center 2.7 4.8 5.5

# Camera orientation relative to center of interest and projection
# theta [-1.0f, 1.0f]
# phi   [0.0f, 1.0f]
# yfov in degrees [1, 179]
# distance from center of interest [0.0f, inf] in meters
# This setting is for the scene_nvlink_spheres_5_5_5.txt

camera 0.57 0.65 45 23

# Path with an existing(!) folder and optional partial filename prefix which should receive the screenshots. 
# If this is just a folder, end it with '/'

prefixScreenshot "./nvlink_shared"

# Tonemapper settings.
# Neutral tonemapper GUI settings showing the linear image:
# gamma 1
# whitePoint 1
# burnHighlights 1
# crushBlacks 0
# saturation 1
# brightness 1

# Standard tonemapper settings:
gamma 2.2
colorBalance 1 1 1
whitePoint 1
burnHighlights 0.8
crushBlacks 0.2
saturation 1.2
brightness 0.8