can I create a heatmap overlay on an image

Hi all,

I have an image (through image sampler that I would like to add an additional overlay of heatmap based on the units brightness, or just hightlight the value exceeding a certain values that possible??

Thanks!!

Replies to This Discussion

Permalink Reply by Danny Boyes on July 14, 2014 at 6:07am

Are you reading the values from your image or are they coming from another source?

Permalink Reply by Dalia Hafiz on July 14, 2014 at 7:26am

Hi Danny, i am trying to read the values from another source (a list)

Permalink Reply by Danny Boyes on July 14, 2014 at 7:46am

OK you don't need the Image sampler then. Also you cannot use the image, as such, in GH. Place a picture frame in the Rhino Document and reference this as your Input Surface (the actual image is of no consequence at this stage) then create a Mesh representing your grid on this surface and assign a colour based on your list value to each vertex.

i'll post an example in a few minutes

Permalink Reply by Danny Boyes on July 14, 2014 at 8:05am

Unfortunately this approach doesn't work as there is no Alpha channel on the Mesh Vertex Colours so you cannot directly control transparency. My example here is a result of baking the mesh and placing behind my transparent map

Of course it is important the order of your list of values and matches the number of vertices

Permalink Reply by Danny Boyes on July 14, 2014 at 9:11am

Thinking about it more you can [Iso Trim] the Surface into a grid of smaller surfaces and assign a material to them with the [Custom Preview] component to get a transparent overlay.