[Sidefx-houdini-list] object ID passes

Gary Jaeger gary at corestudio.com
Thu Nov 3 12:04:37 EDT 2016


Also, do people use Takes? Seems like a decent thing but not sure how much it’s used

Gary Jaeger / 650.728.7957 direct / 415.518.1419 mobile
http://corestudio.com <http://corestudio.com/>
> On Nov 3, 2016, at 8:52 AM, Gary Jaeger <gary at corestudio.com> wrote:
> 
> Great, thanks Alvaro. I’ll take a look.
> 
> What I need is pretty common which makes me think I’m missing something. A live action plate with a table and a some tablets, phones etc. We’re adding fx. So the devices and table need to reflect the fx but not cast their own shadows. The fx need to reflect in everything and cast shadows on everything. I’m used to being able to generate in v-ray raw reflection and raw shadow passes and being able to exclude primary visibility of objects. Usually can get everything we need in one render pass. That sort of thing. Early days of mantra for us but just thought we’d dive in head first :)
> 
> Gary Jaeger / 650.728.7957 direct / 415.518.1419 mobile
> http://corestudio.com <http://corestudio.com/>
>> On Nov 3, 2016, at 8:19 AM, Alvaro Castaneda <varomix at gmail.com <mailto:varomix at gmail.com>> wrote:
>> 
>> Hi Gary
>> is very simple to do, you could use the Op_Id pass, is a diagnostic pass in
>> matra, is already there in the extra images, that will generate a different
>> ID for each NODE, if you want something per material, just use a parameter
>> node inside the material, name it something like Obj_ID1  make it a color
>> and assign red for example, make it export always and make that a new extra
>> image plane with that name,
>> for other materials just copy that node and change the color.
>> 
>> 
>> here's an example file http://box.varomix.net/index.php/s/irWlqTI0ph9MwYN <http://box.varomix.net/index.php/s/irWlqTI0ph9MwYN>
>> 
>> if you have any questions let me know
>> 
>> On Thu, Nov 3, 2016 at 8:50 AM, Gary Jaeger <gary at corestudio.com <mailto:gary at corestudio.com>> wrote:
>> 
>>> Thanks Olivier but it's all Mantra at the moment.
>>> 
>>> On Thu, Nov 3, 2016 at 7:34 AM, Olivier Jeannel <facialdeluxe at gmail.com <mailto:facialdeluxe at gmail.com>>
>>> wrote:
>>> 
>>>> I think Redshift handles this (include / exclude object  from light) ;
>>> and
>>>> this might worth checking but I think there is a control tab in the
>>> "object
>>>> redshift parameters" that gives some controls on the rays (shadow,
>>>> refractions, etc...).
>>>> 
>>>> On Thu, Nov 3, 2016 at 3:21 PM, Peter Bowmar <pbowmar at gmail.com <mailto:pbowmar at gmail.com>> wrote:
>>>> 
>>>>> All shadow casting control is done on the Light's Shadow Mask.
>>>>> 
>>>>> There is no way to set an object to cast shadows on others but not cast
>>>> on
>>>>> itself.
>>>>> 
>>>>> Likewise, all light controls are per-object, you can't tell a light to
>>>> not
>>>>> illuminate an object.
>>>>> 
>>>>> This used to be fixable (with a lot of work) using message passing
>>>> between
>>>>> custom light and surface shaders, however with PBR I think this is much
>>>>> harder now :(
>>>>> 
>>>>> Cheers,
>>>>> 
>>>>> Peter B
>>>>> 
>>>>> On 3 November 2016 at 07:14, Gary Jaeger <gary at corestudio.com <mailto:gary at corestudio.com>> wrote:
>>>>> 
>>>>>> And related (at least to this job) is there a way to set objects to
>>> not
>>>>>> cast shadows? I'm thinking here of the maya render settings where
>>> it's
>>>>>> possible to set things like "casts shadows" "receives shadows"
>>> "visible
>>>>> in
>>>>>> reflections" etc
>>>>>> 
>>>>>> Thanks!
>>>>>> 
>>>>>> On Thu, Nov 3, 2016 at 6:34 AM, Gary Jaeger <gary at corestudio.com <mailto:gary at corestudio.com>>
>>>> wrote:
>>>>>> 
>>>>>>> Hi. I’m looking for a way to generate object IDs ala v-ray
>>>> multi-mattes
>>>>>> or
>>>>>>> similar. So adding a channel to an exr where objectA matte is in
>>> the
>>>>> red,
>>>>>>> objectB is in the green, etc.
>>>>>>> 
>>>>>>> *Gary Jaeger */ 650.728.7957 direct / 415.518.1419 mobile
>>>>>>> http://corestudio.com <http://corestudio.com/>
>>>>>>> 
>>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> --
>>>>>> Gary Jaeger // Core Studio
>>>>>> 249 Princeton Avenue
>>>>>> Half Moon Bay, CA 94019
>>>>>> 650.728.7957 (direct) • 650.728.7060 (main)
>>>>>> http://corestudio.com <http://corestudio.com/>
>>>>>> _______________________________________________
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>>>>>> Sidefx-houdini-list at sidefx.com
>>>>>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> --
>>>>> Cheers,
>>>>> 
>>>>> Peter B
>>>>> _______________________________________________
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>>> 
>>> 
>>> 
>>> --
>>> Gary Jaeger // Core Studio
>>> 249 Princeton Avenue
>>> Half Moon Bay, CA 94019
>>> 650.728.7957 (direct) • 650.728.7060 (main)
>>> http://corestudio.com <http://corestudio.com/>
>>> _______________________________________________
>>> Sidefx-houdini-list mailing list
>>> Sidefx-houdini-list at sidefx.com
>>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>> 
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