No bumpmap at all

Rendering
,
1

This is maybe a topic for @nathanletwory
Today I try to render a scene with a bump map. I am not able to create a (cycles) rendering with a bump map.
I also try to set the bump.strengh.factor to 10
I use a pbr material. To test the bump there is just a bump and a light grey in the Material.

In the rendered Viewport (not Raytraced I am able to see the Bump map)
In the Retrace mode oder while rendering the bump map is gone. I also try bella to find out where the problem is and bella is able to render the bump map with the same material settings.

no Bump with Cycles:

no bump cycles
no bump cycles1920Ă—1280 23.2 KB

Bump with Bella:

bump map bella
bump map bella1920Ă—1280 341 KB

Bump in rendered viewport:

Screenshot rendered view
Screenshot rendered view1920Ă—1294 258 KB

my System info:
Rhino 8 SR21 2025-6-10 (Rhino 8, 8.21.25161.18002, Git hash:master @ d1727ccd678f61173f568509b05829e0850184bf)
License type: Commercial, build 2025-06-10
License details: Cloud Zoo

Apple macOS Version 15.5 (Build 24F74) (Physical RAM: 64GB)
Mac Model Identifier: Mac16,5
Language: en
.NET 8.0.14

Metal GPU Family Apple 7
Metal GPU Family Common 3
Metal GPU Family Mac 2
Graphics processors
Apple M4 Max
P27u-20 (2560 x 1440 @ 60.00Hz)
GPU Vendor: Apple

USB devices
Realtek: USB 10/100/1000 LAN
Apple Inc.: Apple Keyboard
Lenovo: P27u-20

Bluetooth devices
None

Third party kernel extensions
None

Third party plugins
/usr/lib/swift/libswiftCore.dylib
/usr/lib/swift/libswiftObjectiveC.dylib
/usr/lib/swift/libswiftCoreFoundation.dylib
/usr/lib/swift/libswiftDarwin.dylib
/usr/lib/swift/libswiftDispatch.dylib
/usr/lib/swift/libswiftIOKit.dylib
/usr/lib/swift/libswiftSystem.dylib
/usr/lib/swift/libswiftXPC.dylib
/usr/lib/swift/libswift_Builtin_float.dylib
/usr/lib/swift/libswift_Concurrency.dylib
/usr/lib/swift/libswift_StringProcessing.dylib
/usr/lib/swift/libswift_errno.dylib
/usr/lib/swift/libswift_math.dylib
/usr/lib/swift/libswift_signal.dylib
/usr/lib/swift/libswift_stdio.dylib
/usr/lib/swift/libswift_time.dylib
/usr/lib/swift/libswiftos.dylib
/usr/lib/swift/libswiftsys_time.dylib
/usr/lib/swift/libswiftunistd.dylib
/usr/lib/swift/libswiftDistributed.dylib
/usr/lib/swift/libswiftObservation.dylib
/usr/lib/swift/libswiftSynchronization.dylib
/usr/lib/swift/libswiftMetal.dylib
/usr/lib/swift/libswiftOSLog.dylib
/usr/lib/swift/libswiftQuartzCore.dylib
/usr/lib/swift/libswiftUniformTypeIdentifiers.dylib
/usr/lib/swift/libswiftsimd.dylib
/usr/lib/swift/libswiftRegexBuilder.dylib
/usr/lib/swift/libswift_RegexParser.dylib
/usr/lib/swift/libswiftCoreAudio.dylib
/usr/lib/swift/libswiftCryptoTokenKit.dylib
/usr/lib/swift/libswiftAVFoundation.dylib
/usr/lib/swift/libswiftCoreLocation.dylib
/usr/lib/swift/libswiftCoreMIDI.dylib
/usr/lib/swift/libswiftCoreMedia.dylib
/usr/lib/swift/libswiftCoreImage.dylib
/usr/lib/swift/libswiftAccelerate.dylib
/usr/lib/swift/libswiftNaturalLanguage.dylib
/usr/lib/swift/libswiftMLCompute.dylib
/usr/lib/swift/libswiftCompression.dylib
/usr/lib/swift/libswiftDataDetection.dylib
/usr/lib/swift/libswiftCoreGraphics.dylib
/usr/lib/swift/libswiftFoundation.dylib
/usr/lib/swift/libswiftSwiftOnoneSupport.dylib
/Library/Frameworks/3DconnexionClient.framework/Versions/A/3DconnexionClient
/usr/lib/usd/libusd_ms.dylib
/usr/lib/swift/libswiftIntents.dylib
/usr/lib/swift/libswiftSpatial.dylib
/usr/lib/swift/libswiftPassKit.dylib
/usr/lib/swift/libswiftAppleArchive.dylib
/usr/lib/swift/libswiftDemangle.dylib
/usr/lib/swift/libswiftVideoToolbox.dylib
/usr/lib/swift/libswiftGameplayKit.dylib
/usr/lib/swift/libswiftSpriteKit.dylib
/usr/lib/swift/libswiftGLKit.dylib
/usr/lib/swift/libswiftMetalKit.dylib
/usr/lib/swift/libswiftModelIO.dylib
/usr/lib/swift/libswiftSceneKit.dylib
/usr/lib/swift/libswiftMapKit.dylib
/Users/thingybook/Library/Application Support/McNeel/Rhinoceros/8.0/MacPlugIns/bella_rhino.rhp/libbella_dotnet_native.dylib
/Users/thingybook/Library/Application Support/McNeel/Rhinoceros/8.0/MacPlugIns/bella_rhino.rhp/libdl_usd_ms.dylib
/usr/lib/log/liblog_network.dylib

Rhino plugins that do not ship with Rhino
/Users/thingybook/Library/Application Support/McNeel/Rhinoceros/8.0/MacPlugIns/bella_rhino.rhp “Bella” 25.3.0.0

Rhino plugins that ship with Rhino
/Applications/Rhino 8.app/Contents/Frameworks/RhMaterialEditor.framework “Renderer Development Kit” 8.21.25161.1002
/Applications/Rhino 8.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/Commands.rhp “Commands” 8.21.25161.18002
/Applications/Rhino 8.app/Contents/PlugIns/NamedSnapshots.rhp “Snapshots” 8.21.25161.1002
/Applications/Rhino 8.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/RDK_EtoUI.rhp “RDK_EtoUI” 8.21.25161.18002
/Applications/Rhino 8.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/MeshCommands.rhp “MeshCommands” 8.21.25161.18002
/Applications/Rhino 8.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/RhinoRenderCycles.rhp “Rhino Render” 8.21.25161.18002
/Applications/Rhino 8.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/RhinoCycles.rhp “RhinoCycles” 8.21.25161.18002
/Applications/Rhino 8.app/Contents/PlugIns/SectionTools.rhp “SectionTools” 8.21.25161.1002
/Applications/Rhino 8.app/Contents/PlugIns/Displacement.rhp “Displacement” 8.21.25161.1002
/Applications/Rhino 8.app/Contents/PlugIns/PanelingTools.rhp “PanelingTools” 8.21.25161.1002
/Applications/Rhino 8.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/RhinoDLR_Python.rhp “IronPython” 8.21.25161.18002
/Applications/Rhino 8.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/GrasshopperPlugin.rhp “Grasshopper” 8.21.25161.18002
/Applications/Rhino 8.app/Contents/Frameworks/RhCore.framework/Resources/ManagedPlugIns/RhinoCodePlugin.rhp “RhinoCodePlugin” 8.21.25161.18002

2

Your BumpStrengthFactor may need to be as high as 1000 to make it work…

1 Like
3

try setting the bump strength factor to like 1000

this is a bug we are trying to sort.