Add Point

[sparkChan]

hi, everyone.

I want to add a point to sphere when frame is equal to 10.so I create a python sop and write:

geo = hou.pwd().geometry()
if hou.frame() == 10:
   point = geo.createPoint()
   point.setPosition((1,0,0))

but when frame is greater than 10, the point disappears.

I want to keep the point, so what's the problem?

thanks.

[sanostol]

after frame 10 the condition is not true so not point is generated. this only works in dops(sopsolver) or pops (source)

hi, everyone.

I want to add a point to sphere when frame is equal to 10.so I create a python sop and write:

geo = hou.pwd().geometry()
if hou.frame() == 10:
   point = geo.createPoint()
   point.setPosition((1,0,0))

but when frame is greater than 10, the point disappears.

I want to keep the point, so what's the problem?

thanks.

[sparkChan]

after frame 10 the condition is not true so not point is generated. this only works in dops(sopsolver) or pops (source)

In my mind, I think if I create a point, it will keep it, no matter the condition is true or false.

just like sop solver, it can keep the previous state.

do you think what should I do to add point to sphere under this condition?

thanks

[Macha]

In a sense there is no previous or after in sops. Any frame can be cooked independently from any other, so it is possible to cook frame 234 without ever visiting Frame 10.

Well, that's how I understand it.

Edited June 6, 2011 by Macha

[sanostol]

timedependent modeling means solving, so sopsolver is the way to go i think

or in this very special case You could change Your expression to $FF>=10, but I think that is not what You are looking for

[zarti]

hi, everyone.

I want to add a point to sphere when frame is equal to 10.so I create a python sop and write:

geo = hou.pwd().geometry()
if hou.frame() == 10:
   point = geo.createPoint()
   point.setPosition((1,0,0))

but when frame is greater than 10, the point disappears.

I want to keep the point, so what's the problem?

thanks.

there is no problem . in reality , you simply wanted the point to appear on Frame 10 and beyond ...

if so , replace the "==" with ">" .

geo = hou.pwd().geometry()
if hou.frame() > 10:
   point = geo.createPoint()
   point.setPosition((1,0,0))

edit: forgot , also replace the "10" with "9" ..

.cheers

Edited June 6, 2011 by zarti

[hopbin9]

The node network is cooked on every frame. That's why it disappears.

[zarti]

The node network is cooked on every frame. That's why it disappears.

the point disappears because the code tells it 'to disappear' .. or better lets say ; 'to not appear' .

try my suggestion ..

[hopbin9]

the point disappears because the code tells it 'to disappear' .. or better lets say ; 'to not appear' .

Yes, I was trying to point out the concept that the network is cooked on every frame. If the coder understand, then he would understand his mistake