Is there a way to compare two geometry in houdini like certain attribute like Position and then color based on difference

You can do that with VEX , for example connect two geometry to the Point VOP , then subtract their position with together and connect it's result to Cd !

tarjun
Is there a way to compare two geometry in houdini like certain attribute like Position and then color based on difference

There's a command line tool: geodiff


% geodiff
Usage: geodiff <fileA> <fileB> [<fileA1> <fileB1> ]
Display differences between geometry files.

Options:
-t tol Specify floating point tolerance
-w Ignore missing attributes (only output warning)
-I Skip intrinsic attribute comparison
-P Skip primitive (and vertex) comparison
-T Skip type info comparison
-r “Regression test mode”; searches “correct” directory to
determine what files need to be matched in current directory

NOTE WELL: This is known not to handle:
- packed primitives
- mixed primitive groups (those with trim curves)
- pasted surfaces
- checking if contents of index tables match
- any checks of profile curves/trimming states
It has no known unknown shortcomings.

thanks a lot guys the vex method sounds easy as i need to keep rendering that

mark

tarjun
Is there a way to compare two geometry in houdini like certain attribute like Position and then color based on difference

There's a command line tool: geodiff


% geodiff
Usage: geodiff <fileA> <fileB> [<fileA1> <fileB1> ]
Display differences between geometry files.

Options:
-t tol Specify floating point tolerance
-w Ignore missing attributes (only output warning)
-I Skip intrinsic attribute comparison
-P Skip primitive (and vertex) comparison
-T Skip type info comparison
-r “Regression test mode”; searches “correct” directory to
determine what files need to be matched in current directory

NOTE WELL: This is known not to handle:
- packed primitives
- mixed primitive groups (those with trim curves)
- pasted surfaces
- checking if contents of index tables match
- any checks of profile curves/trimming states
It has no known unknown shortcomings.

Very Nice Util!

Thank you!

mark

tarjun
Is there a way to compare two geometry in houdini like certain attribute like Position and then color based on difference

There's a command line tool: geodiff


% geodiff
Usage: geodiff <fileA> <fileB> [<fileA1> <fileB1> ]
Display differences between geometry files.

Options:
-t tol Specify floating point tolerance
-w Ignore missing attributes (only output warning)
-I Skip intrinsic attribute comparison
-P Skip primitive (and vertex) comparison
-T Skip type info comparison
-r “Regression test mode”; searches “correct” directory to
determine what files need to be matched in current directory

NOTE WELL: This is known not to handle:
- packed primitives
- mixed primitive groups (those with trim curves)
- pasted surfaces
- checking if contents of index tables match
- any checks of profile curves/trimming states
It has no known unknown shortcomings.

Hi, which library does this command line tool geodiff come from? I wanna study the implement of geodiff. Is it an open source tool?

chenzunfeng
Hi, which library does this command line tool geodiff come from? I wanna study the implement of geodiff. Is it an open source tool?

It's a binary application shipped with Houdini ($HFS/bin/geodiff).