# Backward and Forward Integration in Stream Tracer

**URL:** https://discourse.paraview.org/t/backward-and-forward-integration-in-stream-tracer/7176
**Category:** ParaView Support
**Created:** [May 8, 2021, 4:39pm UTC](https://discourse.paraview.org/t/backward-and-forward-integration-in-stream-tracer/7176 "2021-05-08T16:39:33Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![coreman](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/c/7c8e57/32.png) [@coreman](https://discourse.paraview.org/u/coreman)
#### Post date: [May 8, 2021, 4:39pm UTC](https://discourse.paraview.org/t/backward-and-forward-integration-in-stream-tracer/7176/1 "2021-05-08T16:39:33Z")

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Hi there!

Basically, I want to one-color the Streamlines where “z” component is “positive” and one-color the streamlines where the same component is “negative” (on Point / Sphere Source with center (0,0,0) )

I dont think there is a way to do that, but I think that Backward / Forward integration reffers wether the vector\_r direction (considering a sphrere source) is Negative / Positive right?