Occlusion Question

[brucelay]

I am a CG student currently learning Houdini and Renderman.

Does anyone know how I can render the occlusion pass with renderman in Houdini?

I did try to make a occlusion shader with the occlusion Vop in Vex builder. But it worked only in Mantra. The same way does not work in Rman. Does anyone know how I can make it work in rman?

Thank you for your attention!

[brucelay]

Hi!

I am trying to render occlusion in renderman. It only looks fine with spheres but looks wrong with cube. Does anyone know why?

Thank you for your attentions!

#include "normals.h"

light occlusionlight2(

float samples = 256;

color filter = color(1);

output float __nonspecular = 1;)

{

normal Ns = shadingnormal(N);

illuminate (Ps + Ns) { /* force execution independent of light location */

float occ = occlusion(Ps, Ns, samples);

Cl = filter * (1 - occ);

}

}

[rjpieke]

Hi!

I am trying to render occlusion in renderman. It only looks fine with spheres but looks wrong with cube. Does anyone know why?

Thank you for your attentions!

#include "normals.h"

light occlusionlight2(

      float samples = 256;

      color filter = color(1);

      output float __nonspecular = 1;)

    {

      normal Ns = shadingnormal(N);

      illuminate (Ps + Ns) {  /* force execution independent of light location */

float occ = occlusion(Ps, Ns, samples);

Cl = filter * (1 - occ);

      }

    }

18677[/snapback]

If you're using a Box SOP, try turning off "consolidate corner points"

[brucelay]

Thanks again! rjpieke!

It works!

many many thanks!

[Marc]

Threads merged

Please do not start a new thread for every question. If they are related (or in fact the same question) then please continue with the current thread.

M

[brucelay]

Threads merged

Please do not start a new thread for every question. If they are related (or in fact the same question) then please continue with the current thread.

M

18716[/snapback]

Marc

I am sorry about this!

I will keep them in one thread in the future.

Sorry again! and thank you for reminding me!

[brucelay]

HI

I am trying to do some colour bleedings in Houdini with Rman. I used the "irradiance caching" method to generate the .icf files (read/write)

Then I assign the indirect light shader(from prman) to render the colour bleeding scene. But the result is not very good. Can someone pls help me how I can improve the quality of the colour bleeding. I tried to tune up the "Max diffuse depth", but it takes ages to render.

If you are a prman and Houdini user, how do you normal do the "colour bleeding" with "irridiance caching" in Houdini?

Thank you for your time and patience! Any help will be appreciated!

brucelay