image sampler: why I cant use it to show the image?

Replies to This Discussion

Permalink Reply by cmrhm on May 26, 2010 at 4:26pm

I wish David can look at my Q and give me some lights. After trying several things, I began to have sth to show. But I felt this imageSampler used alot of computer resources.

Permalink Reply by Luis Fraguada on May 26, 2010 at 5:08pm

you need to sample the pixels in the image sampler... so plug in a range component to a PointXYZ (into the X and Y inputs for example, z i not useful in this case) and cross reference the pointXYZ...plug THAT into the image sampler...the default output is RGB values, but you can change the filter (by right clicking on the image sampler) to give you other data sets...

Permalink Reply by cmrhm on May 26, 2010 at 5:53pm

Hi, luis: Thanks for the reply.

I am stuck. Trying to minic what you said, but still can't get what I need.

Attachments:

• q_imageSampler02.PNG, 271 KB

Permalink Reply by Damien Alomar on May 26, 2010 at 6:17pm

If you double click on the image sampler, you'll see a domain setting in the dialog that pops up. The sampler is using that domain to determine which pixel to sample. I believe it should be 0 to 1 by default, so think of it like a reparameterized surface.

Permalink Reply by Luis Fraguada on May 27, 2010 at 1:18am

Unplug the slider from the range. The range component should just be default (from 0 to 1) for sampling the image, or change the sampling range in the imagesample as Damien says. You can combine with two ranges (one for image sampling, one for point spacing).

Permalink Reply by cmrhm on May 27, 2010 at 11:14pm

What is the last second one besides the circle component?

I made my scheme work now. The issue indeed was with the domain inside image setting. I set it up so high that the image was out of bound.

Permalink Reply by Paolo Cappelletto on May 27, 2010 at 3:59am

slightly different with "photoshop treatment.

Attachments:

• bubble_sampler.ghx, 153 KB

Permalink Reply by cmrhm on May 27, 2010 at 9:55pm

Paolo:

Thank you very much for the help. I will check your files and concept.

Permalink Reply by cmrhm on May 27, 2010 at 10:05pm

Guys:

I further developed my file. There are more issues need to be resolved. Pls check the image file I posted. My idea is extruding the area pixeled with the image, other area will not be influenced.

The ideal situation is to using the output from "image sampler" component to set the location and size for the extrusion. No success so far.

Attachments:

• forComments_05272010_02.PNG, 80 KB
• forComments_05272010_03.PNG, 461 KB