Camera Mapping

[nomad]

hello everyone.

how is it possible to do camera mapping in houdini ? i have read wiki but it was very uncertain .... may be someone know tutorials or articles about this quastion???? i have searchig on forums but there was not enough information for this quastion.

[ptakun]

Hello Nomad!!

Look example:

ndc.hipnc

bests

Ptakun

[nomad]

thank you ptakun, i'll check it out

[nomad]

hello everyone

well, i still have a torture with camera mapping....

i try to project textures from three side - front, left, right.

so, i have three cameras, which projects textures on geometry.

and i have main camera, from which i looking on my object.

I want the requisite texture downloads in definite space

for example:

if the main camera situated in zone of front camera - downloads the texture projected from the front camera

if the main camera find oneself in zone of left camera - downloads the texture projected from the left camera

i have done some experiment with simply geometry , and i suppose that solution hiding in the switch sop (switched between camera prijects).... may be i must write any script in SELECT INPUT???

[symek]

Can you explain little more what kind of effect you are going to achieve? I have an unclear suspicion that you're tring to do something relatively easy in some terrible difficult way. I can be wrong though!

Sy

[nomad]

i'll try

i whant to flying around the big ben tower

that is why i need to project four textures on four side of tower (from four cameras)

how can i do that?

[digitallysane]

i'll try

i whant to flying around the big ben tower

that is why i need to project four textures on four side of tower (from four cameras)

how can i do that?

You can map each face of the tower separately, there's no need for camera projection (you can specify primitive umber in the UV texture SOP).

Dragos

[symek]

i'll try

i whant to flying around the big ben tower

that is why i need to project four textures on four side of tower (from four cameras)

how can i do that?

Yes, ok! But why you need switch cameras for that!? Four cameras, four projections? As digitallysane said this can be done by simply projecting as many textures as you'd like on geo deviding it with groups or using LayerSOP.

You can also specify as many projectors as you wish in the same time!

cheers.,

Sy.

[nomad]

well, thank you

.... give me please an example where texture projection from camera (from many cameras) is irreplaceable

my goal is TO TEACH this technic.

especially projections from many cameras, not from single.

i deside to project texture on big ben, probably it is not good example.

[nomad]

http://www.glyphfx.com/main_old.htm

i am interested just in method --------- how to combain a few camera projections

[old school]

You can use different uv layers to do this.

See the example file I attached. I commented some of the SOPs.

layered_uv_sets.hip.zip

I like to structure my Layer SOPs (to generate the various uv layers) running left to right instead of all in a straight line.

[nomad]

thank you, old school

your example is very helpful for me