[vfx] maya and houdini - flicker and motion blur notes

maya vray gobo flicker artifact

• vray if secondary bounce is brute force , will have black artifacts in dark areas
• so need to change secondary bounce to light cache to fix black bucket artifact
• so need to change min subdiv from 1 to 4 or 8 to fix black bucket artifact
• the black swimming artifacts are square buckets error

maya vray snow flicker

• color mapping
• subpixel mapping - check
• clamp output - check
• clamp level 20
• clamp max ray intensity - check
• max ray intensity 10

maya high quality fix flicker

• vray high quality is min 4 max 32 threshold 0.05
• vray ultra high quality, if still flickers, is min 8 max 128 threshold 0.01

houdini banners hot spot flicker

• render rop > limits > color limit change from 10 to 5 for less flicker

houdini motion blur baked (special occasion)

• geo time samples 1
• render > sampling > velocity blur on (on the group)
• no time blend node (inside the group)

houdini motion blur using timeblend

• geo time samples 2
• render > sampling > no velocity blur (on the group)
• has time blend node (inside the group)

houdini why use timeblend

• timeblend node for sequential bgeo banners, cfx banners don't need this
• anim and cfx crowd that come in as alembic should have velocity data in them