Fenolis
The Block Begin node has a button to create another Begin node set to Fetch Metadata....
Oh， thanks ，Fenolis~
You reminded me that
Only to create another Begin node brings in the attributes "iteration"
Thanks a lot！
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Technical Discussion » How Switch reads value from ForEachPoint?
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- jackdon4682
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Oh， thanks ，Fenolis~
You reminded me that
Only to create another Begin node brings in the attributes "iteration"
Thanks a lot！
Technical Discussion » How Switch reads value from ForEachPoint?
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- jackdon4682
- 24 posts
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My question:
how can I read the value of "iteration" from ForEachPoint node?
for example,
I have 3 different objs connected by Switch node
I want each them to be copied using ForEachPoint node
By expression
I get Wrong results,which all are 0:
It is supposed to be:
So coming to my question
how can I read the value of "iteration" from ForEachPoint node?
Thanks for help in advance!
Official Documents Ref:
https://www.sidefx.com/docs/houdini/model/looping.html [www.sidefx.com]
how can I read the value of "iteration" from ForEachPoint node?
for example,
I have 3 different objs connected by Switch node
I want each them to be copied using ForEachPoint node
By expression
detail("../block_begin1", "iteration", 0)
It is supposed to be:
So coming to my question
how can I read the value of "iteration" from ForEachPoint node?
Thanks for help in advance!
Official Documents Ref:
https://www.sidefx.com/docs/houdini/model/looping.html [www.sidefx.com]
Technical Discussion » Rotate: Matrix right but Quaternion wrong?
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- jackdon4682
- 24 posts
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Zybrand
Hey jackdon4682! ...
Damn, you're so good! I was struggling with the qrotate node and got the information wrong.
I can't thank you enough for the crystal clear explanation!
Technical Discussion » Rotate: Matrix right but Quaternion wrong?
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- jackdon4682
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I'm learning Matrix and Quaternion.
In this case,
I wanna rotate my each cube with the axis 'N'
I get the right result through Matrix but the wrong result through Quaternion
why?
how to use the way "qrotate()" to get the right result?
Right result when i use matrix to rotate:
Wrong Result through the ways of Quaternoin:
gits、pngs and hip in attach.
Thanks for help in advance!
In this case,
I wanna rotate my each cube with the axis 'N'
I get the right result through Matrix but the wrong result through Quaternion
why?
how to use the way "qrotate()" to get the right result?
Right result when i use matrix to rotate:
Wrong Result through the ways of Quaternoin:
gits、pngs and hip in attach.
Thanks for help in advance!
Technical Discussion » At which frame particle is generated？
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- jackdon4682
- 24 posts
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Tanto
In your pop source you can create a "Just Born" group. Do that, and create a pop wrangle node affecting only this group, with:i@emitFrame = @Frame;
yes~
That's exactly the answer I was looking for!
Thank you very much!
Technical Discussion » At which frame particle is generated？
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- jackdon4682
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protozoanfloor(@age * (1 / @TimeInc));
Thanks for your response,
you've provided a new method of calculation!
Technical Discussion » At which frame particle is generated？
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- jackdon4682
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When a particle is generated,
how do I know at which frame it was generated? How can I save the frame number as a particlae attribute？
I read online that it says to use @age==0 to determine this,
But I found that once the particle is generated, @age is greater than 0, there is no such thing as @age equal to 0.
So I can't tell if the particle is generated in this frame or not.
As an example：
I want the particles generated after 20 frames to turn red, not @age at a certain value,
how can I achieve it?
how do I know at which frame it was generated? How can I save the frame number as a particlae attribute？
I read online that it says to use @age==0 to determine this,
But I found that once the particle is generated, @age is greater than 0, there is no such thing as @age equal to 0.
So I can't tell if the particle is generated in this frame or not.
As an example：
I want the particles generated after 20 frames to turn red, not @age at a certain value,
how can I achieve it?
Technical Discussion » Copytopoint node driven by 3@transform?
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- jackdon4682
- 24 posts
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Technical Discussion » Copytopoint node driven by 3@transform?
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- jackdon4682
- 24 posts
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Technical Discussion » Copytopoint node driven by 3@transform?
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- jackdon4682
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In my case,
Instead of p@orient, I can combine Copytopoint nodes and adjust the rotation value with 3@transform.
But I'm a little confused that I find nothing with 3@transform in official manual,
Is it an attribute defined as a houdini known type?
Instead of p@orient, I can combine Copytopoint nodes and adjust the rotation value with 3@transform.
But I'm a little confused that I find nothing with 3@transform in official manual,
Is it an attribute defined as a houdini known type?
matrix3 m = ident(); rotate(m, radians(chf("angel")), set(0,1,0)); 3@transform = m; //p@orient = quaternion(m);
Technical Discussion » Why UVW coordinate instead of @P？
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- jackdon4682
- 24 posts
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BabaJeach one(polygon) has to be calculated(mapped) differently in order to always be able to have(establish) 0-1 values for each u and v.
I appreciate so much for your paient reply,
I've opened your hip,
and I may understand what you say,
the ‘&uv’ returned from xyzdist() refers to each dividual polygon,
limited from 0 to 1, like the below gif I made.
and in the future， for this special calculate way, I'll conneted the xyzdist() and primuv() to use without any doubts ,hhh
and you are a great guy,
thanks for your so detailed response
Technical Discussion » Why UVW coordinate instead of @P？
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- jackdon4682
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tamteThanks for your reply,@P = uvsample(1, "P", 'uv', @P);
yes , I'll follow your words to use uvsample() instead of xyzdist() and primuv() if i wanna use @P.
Technical Discussion » Why UVW coordinate instead of @P？
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- jackdon4682
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BabaJ
...
Thanks for your detailed explaination.
Following your words,I try to take one point to unstander the two different mappings,
but,
I find the difference is so so so huge between the P value and the my_UV which xyzdist() returnd...
why? How can I understand the &uv map result from xyzdist()?
screenshots:
Technical Discussion » Why UVW coordinate instead of @P？
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- jackdon4682
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Please look at my screenshots，
The "@P" is not equal to "my_uv" calculated by xyzdist.
Why?Shouldn’t they be equal? Especially the lines have already put in space，
The "@P" is not equal to "my_uv" calculated by xyzdist.
Why?Shouldn’t they be equal? Especially the lines have already put in space，
int my_primnum; vector my_uv;
xyzdist(2,@P,my_primnum,my_uv);
@P = primuv(1,'P',my_primnum,@P); //wrong code
@P = primuv(1,'P',my_primnum,my_uv); //right code
Technical Discussion » Enter /obj/geo without a drop-down box
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- jackdon4682
- 24 posts
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Tanto
Tried in 19.5.605 and it behaves that way for me too. Not sure when it was fixed but in 20.0.688 the drop down appears as you'd expect.
oh, thanks for your reply,
I may try to update my software version,
thanks.
Technical Discussion » Enter /obj/geo without a drop-down box
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- jackdon4682
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When I enter /obj/ in the parameter box,
the drop-down box will not appear continuously,
I must press the space bar and delete it before the drop-down box appears.
Is there a problem with my settings?
version:
Houdini 19.5.605
the drop-down box will not appear continuously,
I must press the space bar and delete it before the drop-down box appears.
Is there a problem with my settings?
version:
Houdini 19.5.605
Technical Discussion » Why is it Wrong typing "v@P += (0,@mask*3,0); "？
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- jackdon4682
- 24 posts
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alexwheezyOh, alexwheezy, thanks a lot!
The first option will create the value of only the last element. You can check this if you write, for example,You can see that the remaining elements have no effect on the expression.v@P += (0,@mask*3,10);
To make it work as a vector you need to change the example a little.v@P += set(0,@mask*3,10);
It works when I use set(0,@mask*3,10);
And I've noticed that claiming a vector should use {} instead of ()
so it also work when I type:
v@P += {0,5,0};
But be carefully ,it occur an error if you reference a property @mask ，like this：
v@P += {0,@mask,0};
so in my case, the best way is to use v@P += set(0,@mask*3,10); like you say.
Technical Discussion » Why is it Wrong typing "v@P += (0,@mask*3,0); "？
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- jackdon4682
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One simply Vex code.
It doesn't make sense When I type v@P += (0,@mask*3,0);
But it works to type v@P.y += @mask*3;
I want to know why? And how to write it correctly in the first way?
It doesn't make sense When I type v@P += (0,@mask*3,0);
But it works to type v@P.y += @mask*3;
I want to know why? And how to write it correctly in the first way?
Technical Discussion » @pos1 to parameter doesn't work？
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- jackdon4682
- 24 posts
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And I'm thinking about solving more complex situation,(as a houdini beginner)
such as pushing small spheres to the surface that is just tangent to the big ball.
the node Peak works well,
and I've found a more simple way which uses Vop to solve it.
thanks a lot for you to help me understand the node and how to use point()
such as pushing small spheres to the surface that is just tangent to the big ball.
the node Peak works well,
and I've found a more simple way which uses Vop to solve it.
thanks a lot for you to help me understand the node and how to use point()
Technical Discussion » @pos1 to parameter doesn't work？
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- jackdon4682
- 24 posts
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animatrix_
-1 is for when you use spare parms so that you don't have to type which node you are referencing. If you just want to use the first input 0 is perfectly valid.
But if you need to reference the current point's attribute for each point for the Peak node, you will have to write your own peak operation in VEX.
Unfortunately,when I type -1 ，Error occured...
I seem to understand what you said.In generally, number 0 refer to the first input. And maybe it's enough.
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