---
name: "xshowtrace"
section: "1"
platform: "linux"
package: "radiance"
version: "4R1+20120125-1+b1"
release: "Debian 7 (Wheezy)"
platforms: ["linux"]
url: "https://new.carta.tech/xshowtrace"
---

# xshowtrace(1)

interactively show rays traced on RADIANCE image under X11

## NAME

xshowtrace - interactively show rays traced on RADIANCE image under X11

## SYNOPSIS

**xshowtrace** \[ **-s** \]\[ **-T** \]\[ **rtrace options** \] **octree** **picture**

## DESCRIPTION

*Xshowtrace* takes a RADIANCE octree and a picture file and displays it on an X11 window server using *[ximage(1)](/ximage/1.md).* The picture should have been created from a previous *[rpict(1)](/rpict/1.md)* or *[rvu(1)](/rvu/1.md)* calculation using the given octree. Once the image is displayed, the user can use the 't' command of *ximage* to select points on the image to display the ray tree. *Rtrace* then produces a ray tree, which *xshowtrace* will display (in red on a color screen). The *-s* option slows the display of each ray traced to make it easier to follow the process. The *-T* option traces rays to light sources, which are normally hidden.

## AUTHOR

Greg Ward

## BUGS

If the pointer is moved between the time 't' is pressed and *xshowtrace* starts drawing rays, the rays will be displaced.

## SEE ALSO

[oconv(1)](/oconv/1.md), [rpict(1)](/rpict/1.md), [rtrace(1)](/rtrace/1.md), [rvu(1)](/rvu/1.md), [ximage(1)](/ximage/1.md)