How to read Frame stamp with python ?

[raxto]

Hi, is there a way how to read Frame stamp like %primitives with python or mel ?

thx
Rasto

[vlado]

Not for the moment. I will add it as a feature request though - either that, or writing the stamp variables as OpenEXR meta attributes. Do you have any preference as to which method would be better?

Best regards,
Vlado

[bigbossfr]

The best of the best would be to output a .xml with some infomations, statistiques....

[raxto]

Hi Vlado, thx for your reply,

1. for advanced users is better way to have access all available variables in Maya this way:

Pre Render Frame MEL: python("import writemeta\nreload(writemeta)")

writemeta.py

import maya.cmds as cmds
distance = cmds.getAttr('object.translateX')
cmds.setAttr("vraySettings.imgOpt_exr_attributes", "objectDistance="+str(distance)+", type="string")

(here user need to read V-Ray variables like %vrayversion,%filename,%frame,%primitives,%rendert ime,%computername, etc...) for example:

distance = [COLOR="#008000"][B]vrayVar.vrayversion[/B][/COLOR]

2. and second, easier way is have option write dynamic variables to Extra Attributes: comment=hello;test=%vrayversion or comment=hello;vrayVar.vrayversion

Out of Topic: Vlado, can you help me with this ? When i try to read %polycount of scene where is only vrmesh, it's not displaying real polycount of mesh. http://forums.chaosgroup.com/showthr...-in-rendertime

[raxto]

The best of the best would be to output a .xml with some infomations, statistiques....

i mean better way is read it internaly, because reading external files = more problems.

maybe some internal array of per frame stats. (not all frames, only actual frame log)

array = [raycasts=16619275, camera_rays=16619275, shadow_rays=0, gi_rays=0, reflection_rays=0]

[bigbossfr]

I am writting something, give me some minutes

[bigbossfr]

Ok, i writed this quickly for you.
Here a function in python which read the vray log and get some informations :

import os
def getAllStatisticFromLog():
    allEnv = os.environ.keys()
    if 'VRAY_FOR_MAYA_LOG_FILE_NAME' in allEnv and 'VRAY_FOR_MAYA_LOG_FILE_PATH' in allEnv:
        logPath = os.path.join(os.environ['VRAY_FOR_MAYA_LOG_FILE_PATH'], os.environ['VRAY_FOR_MAYA_LOG_FILE_NAME'])
    else:
        logPath = os.path.join(os.environ['TMP'], "vray4maya_log.txt")
    
    numbTreeFaces = None
    numbRaycasts = None
    numbCameraRays = None
    numbShdRays = None
    numbGIRays = None
    numbReflRays = None
    numbRefracRays = None
    numbUnsRays = None
    numbInterPrim = None
    numbSDTriangle = None
    numbMBTriangle = None
    numbStaticPrim = None
    numbMovPrim = None
    numbInfPrim = None
    totalFrameTime = None
    
    if os.path.isfile(logPath):
        with open(logPath,'r') as f:
            output = f.readlines()
            whereToStart = [i for i, x in enumerate(output) if "Creating and initializing renderer." in x]
            output = output[whereToStart[-1]:]
            for line in output:
                if "Number of tree faces:" in line:
                    numbTreeFaces = int(line.split()[-1])
                elif "Number of raycasts:" in line:
                    numbRaycasts = int(line.split()[-1])
                elif "Camera rays:" in line:
                    numbCameraRays = int(line.split()[-1])
                elif "Shadow rays:" in line:
                    numbShdRays = int(line.split()[-1])
                elif "GI rays:" in line:
                    numbGIRays = int(line.split()[-1])
                elif "Reflection rays:" in line:
                    numbReflRays = int(line.split()[-1])
                elif "Refraction rays:" in line:
                    numbRefracRays = int(line.split()[-1])
                elif "Unshaded rays:" in line:
                    numbUnsRays = int(line.split()[-1])
                elif "Number of intersectable primitives:" in line:
                    numbInterPrim = int(line.split()[-1])
                elif "SD triangles:" in line:
                    numbSDTriangle = int(line.split()[-1])
                elif "MB triangles:" in line:
                    numbMBTriangle = int(line.split()[-1])
                elif "Static primitives:" in line:
                    numbStaticPrim = int(line.split()[-1])
                elif "Moving primitives:" in line:
                    numbMovPrim = int(line.split()[-1])
                elif "Infinite primitives:" in line:
                    numbInfPrim = int(line.split()[-1])
                elif "Total frame time" in line:
                    totalFrameTime = float(line.split()[-2][1:])
    return numbTreeFaces, numbRaycasts, numbCameraRays, numbShdRays, numbGIRays, numbReflRays, numbRefracRays, numbUnsRays, numbInterPrim, numbSDTriangle, numbMBTriangle, numbStaticPrim, numbMovPrim, numbInfPrim, totalFrameTime

You can use this code into postFrame mel, and create another function to add all data into exr metadata.

[raxto]

Ok, i writed this quickly for you.
Here a function in python which read the vray log and get some informations :

import os
def getAllStatisticFromLog():
    allEnv = os.environ.keys()
    if 'VRAY_FOR_MAYA_LOG_FILE_NAME' in allEnv and 'VRAY_FOR_MAYA_LOG_FILE_PATH' in allEnv:
        logPath = os.path.join(os.environ['VRAY_FOR_MAYA_LOG_FILE_PATH'], os.environ['VRAY_FOR_MAYA_LOG_FILE_NAME'])
    else:
        logPath = os.path.join(os.environ['TMP'], "vray4maya_log.txt")
    
    numbTreeFaces = None
    numbRaycasts = None
    numbCameraRays = None
    numbShdRays = None
    numbGIRays = None
    numbReflRays = None
    numbRefracRays = None
    numbUnsRays = None
    numbInterPrim = None
    numbSDTriangle = None
    numbMBTriangle = None
    numbStaticPrim = None
    numbMovPrim = None
    numbInfPrim = None
    totalFrameTime = None
    
    if os.path.isfile(logPath):
        with open(logPath,'r') as f:
            output = f.readlines()
            whereToStart = [i for i, x in enumerate(output) if "Creating and initializing renderer." in x]
            output = output[whereToStart[-1]:]
            for line in output:
                if "Number of tree faces:" in line:
                    numbTreeFaces = int(line.split()[-1])
                elif "Number of raycasts:" in line:
                    numbRaycasts = int(line.split()[-1])
                elif "Camera rays:" in line:
                    numbCameraRays = int(line.split()[-1])
                elif "Shadow rays:" in line:
                    numbShdRays = int(line.split()[-1])
                elif "GI rays:" in line:
                    numbGIRays = int(line.split()[-1])
                elif "Reflection rays:" in line:
                    numbReflRays = int(line.split()[-1])
                elif "Refraction rays:" in line:
                    numbRefracRays = int(line.split()[-1])
                elif "Unshaded rays:" in line:
                    numbUnsRays = int(line.split()[-1])
                elif "Number of intersectable primitives:" in line:
                    numbInterPrim = int(line.split()[-1])
                elif "SD triangles:" in line:
                    numbSDTriangle = int(line.split()[-1])
                elif "MB triangles:" in line:
                    numbMBTriangle = int(line.split()[-1])
                elif "Static primitives:" in line:
                    numbStaticPrim = int(line.split()[-1])
                elif "Moving primitives:" in line:
                    numbMovPrim = int(line.split()[-1])
                elif "Infinite primitives:" in line:
                    numbInfPrim = int(line.split()[-1])
                elif "Total frame time" in line:
                    totalFrameTime = float(line.split()[-2][1:])
    return numbTreeFaces, numbRaycasts, numbCameraRays, numbShdRays, numbGIRays, numbReflRays, numbRefracRays, numbUnsRays, numbInterPrim, numbSDTriangle, numbMBTriangle, numbStaticPrim, numbMovPrim, numbInfPrim, totalFrameTime

You can use this code into postFrame mel, and create another function to add all data into exr metadata.

but, how you want to write this data to images ?

[bigbossfr]

Just use Python Exr lib : http://excamera.com/articles/26/doc/openexr.html

[raxto]

You can use this code into postFrame mel, and create another function to add all data into exr metadata.

if you writing postFrame mel, meta data will be offseted 1 frame.

Just use Python Exr lib : http://excamera.com/articles/26/doc/openexr.html

V-Ray is for artists, not for programmers.
I mean this is wrong way to do all externaly, if vray can handle it for you internaly and simply.