How to make a point's normals pointing to another point

[ghang]

Hi,

I would like to know how to make a point's normals pointing to another point

as follow image, i would like to let the point number 0 's normals pointing to point number 1.

ps: this 2 point are create by different ADD SOP.

i use POINT SOP and select add normals with expression as bellow

(-point("../point1",0,"P",0))+point("../point2",0,"P",0)

&&

(-point("../point1",0,"P",1))+point("../point2",0,"P",1)

&&

(-point("../point1",0,"P",2))+point("../point2",0,"P",2)

but the angel of pointing was not exactly correct.

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question 2:

sorry for 1 more question, i would like to know how to mesure the 2 point distance, i would like to use it as my object scale value.

i search in the help context with "point distance, point to point distance" but i only get point to primitive distance solution.

Thanks Very very very much

[Peter Quint]

An easier way to do this is using the second input of the point sop. Connect the point you want normals to point towards to the second input, and then select add normal and set its parameters to $TX2 - $TX, $TY2 - $TY, $TZ2 - $TZ. The $TX etc variables are the position of your current point, $TX2 etc the position of whats connected to the second input.

[wigal123]

To get the distance between the 2 points you can add an attribute after the step Peter suggested. Create a float point attribute and put:

length($NX,$NY,$NZ)

into the first value.

this will return the distance based on the normal you created in the previous step. Hope that helps.

[Stalkerx777]

Well the easiest way is to add PolyFrame SOP, set style to "First Edge", entity "points", and Tangent Name set to N.Thats for the curve. For distance use wigal123 method , or in VOPS there is a Distance vop......

[ghang]

thanks very much , is really helpful !!!!