Need help for a simple animation

[ibutter]

I'd like to do a very simple animation but, because I use Houdini since a very short time, I don't know how to do it.

I'd like to rotate a wheel, and I'd like to do it without using the $F parameter (current frame). I'd just like to increment the rotation of the wheel by +10 degree on each frame (around z axis). I've tried that (on the field "rz") but it doesn't work :

ch("rz")+10

Which means (for me) : "take the previous value of rz and add 10". Why does it not work ? Is there any other way to do that ? Thanks by advance !

Lyghur

[zboy]

Hi Lyghur,

It's strange not to use $F, because you said you want to increase the rz value by 10 EACH FRAME, which implies that you need to use $F(otherwise, you may need to use some other channels indirectly).

the expression should be:-

rz = 10*$F

Hope this help!
Tell me if it works or not!
PRmen
P.S.
Your expression doesn't work because houdini don't loop your rz value, it only manipulate once, so your final rz value has only increased by 10 once. If you want increase the rz value based on previous one, you gotta use a "COPY SOP" (If I didn't recall wrong!) to save this value to use the rz value again.

In reply to:
I'd like to do a very simple animation but, because I use Houdini since a very short time, I don't know how to do it.

I'd like to rotate a wheel, and I'd like to do it without using the $F parameter (current frame). I'd just like to increment the rotation of the wheel by +10 degree on each frame (around z axis). I've tried that (on the field "rz") but it doesn't work :

ch("rz")+10

Which means (for me) : "take the previous value of rz and add 10". Why does it not work ? Is there any other way to do that ? Thanks by advance !

Lyghur