Move a Parallel Camera
-
I have this snippet to zoom out - just moves the camera away from the taget along the line-of-sight. Any idea why it works when the Camera is Perspective, but not Parallel?
factor = 0.5 model = Sketchup.active_model view = model.active_view c = view.camera t = c.target e = c.eye up = c.up vec = t - e vec.length = vec.length * factor c.set(e-vec, t, up) -
I changed the factor to 1000 and ran it about 10 times really fast.....that broke my SketchUp
I have not got the right answer, but in parallel mode, backing the camera out should not widen the view of what is ont he screen. It seems like you would need to widen the FOV or something to make it feel like you are backing up.
-
Thanks Chris, that makes sense.
When I plot the Camera eye over several "zoom outs", the cpoints do indicate the Camera is moving away.
So I'm still not sure why the view doesn't appear to move, even if the Camera is. Zoom and Pan still work with a Parallel Camera. Moving the Camera away should still make everything appear smaller.
-
I don't really know what I'm talking about, but from an intuitive view, do you have to transform the OpenGL frustum or camera cone of vision in order for the display to "shrink"? Or is the frustum a fixed thing and ...mumble...mumble??
-
Does appending a call to view.refresh (at the end of the code,) have any effect ??
-
No, no difference.
I did notice that when I switch back to a Perspective Camera, the camera jumps way back.
-
OK.. and what happens when you switch back to Parallel ?
-
A few other questions:
Do these have any effect?
view.invalidate()view.dynamic=true -
Neither has nay effect.
-
Maybe change to perspective mode, then move, then jump back to parallel? Or do that on a camera that is not active_view and then apply that camera to the active view?
-
Yep, thanks. I can make something work. I guess at this point I am curious to understand what's going on.
-
-
Solved.
This code works no matter what mode the camera is in, AND resets the mode back to the previous mode. (See ### bracketed statements that I added.)
zoomtest.rb
<span class="syntaxdefault"></span><span class="syntaxcomment">#<br /><br /></span><span class="syntaxdefault">module SU_Test<br /><br /> </span><span class="syntaxcomment">#<br /><br /></span><span class="syntaxdefault"> def self</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">zoomtest</span><span class="syntaxkeyword">()<br /></span><span class="syntaxdefault"> factor </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> 0.5<br /> model </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> Sketchup</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">active_model<br /> view </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> model</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">active_view<br /> c </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> view</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">camera<br /> </span><span class="syntaxcomment">###<br /></span><span class="syntaxdefault"> cp</span><span class="syntaxkeyword">=</span><span class="syntaxdefault">c</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">perspective</span><span class="syntaxkeyword">?<br /></span><span class="syntaxdefault"> </span><span class="syntaxcomment">###<br /></span><span class="syntaxdefault"> t </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> c</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">target<br /> e </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> c</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">eye<br /> up </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> c</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">up<br /> vec </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> t </span><span class="syntaxkeyword">-</span><span class="syntaxdefault"> e<br /> vec</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">length </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> vec</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">length </span><span class="syntaxkeyword">*</span><span class="syntaxdefault"> factor<br /> </span><span class="syntaxcomment">###<br /></span><span class="syntaxdefault"> c</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">perspective</span><span class="syntaxkeyword">=</span><span class="syntaxdefault">true if cp</span><span class="syntaxkeyword">==</span><span class="syntaxdefault">false<br /> </span><span class="syntaxcomment">###<br /></span><span class="syntaxdefault"> c</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">set</span><span class="syntaxkeyword">(</span><span class="syntaxdefault">e</span><span class="syntaxkeyword">-</span><span class="syntaxdefault">vec</span><span class="syntaxkeyword">,</span><span class="syntaxdefault"> t</span><span class="syntaxkeyword">,</span><span class="syntaxdefault"> up</span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault"> </span><span class="syntaxcomment">###<br /></span><span class="syntaxdefault"> c</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">perspective</span><span class="syntaxkeyword">=</span><span class="syntaxdefault">false if cp</span><span class="syntaxkeyword">==</span><span class="syntaxdefault">false<br /> </span><span class="syntaxcomment">###<br /></span><span class="syntaxdefault"> end<br /><br /> unless defined</span><span class="syntaxkeyword">?(@</span><span class="syntaxdefault">LoadedOnce</span><span class="syntaxkeyword">)==</span><span class="syntaxstring">'instance-variable'<br /></span><span class="syntaxdefault"> </span><span class="syntaxkeyword">@</span><span class="syntaxdefault">LoadedOnce</span><span class="syntaxkeyword">=</span><span class="syntaxdefault">false<br /> end<br /><br /> def self</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">loaded_once</span><span class="syntaxkeyword">()<br /></span><span class="syntaxdefault"> </span><span class="syntaxkeyword">@</span><span class="syntaxdefault">LoadedOnce<br /> end<br /> <br /> def self</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">loaded_once</span><span class="syntaxkeyword">=(</span><span class="syntaxdefault">arg</span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault"> </span><span class="syntaxkeyword">@</span><span class="syntaxdefault">LoadedOnce</span><span class="syntaxkeyword">=</span><span class="syntaxdefault">arg<br /> end<br /><br />end </span><span class="syntaxcomment"># module<br /><br /></span><span class="syntaxdefault"> unless SU_Test</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">loaded_once</span><span class="syntaxkeyword">()<br /></span><span class="syntaxdefault"> </span><span class="syntaxcomment">#<br /></span><span class="syntaxdefault"> UI</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">menu</span><span class="syntaxkeyword">(</span><span class="syntaxstring">'Plugins'</span><span class="syntaxkeyword">).</span><span class="syntaxdefault">add_item</span><span class="syntaxkeyword">(</span><span class="syntaxstring">'Zoom Out Test'</span><span class="syntaxkeyword">)</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">{</span><span class="syntaxdefault"> SU_Test</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">zoomtest</span><span class="syntaxkeyword">()</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">}<br /></span><span class="syntaxdefault"> </span><span class="syntaxcomment">#<br /></span><span class="syntaxdefault"> SU_Test</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">loaded_once</span><span class="syntaxkeyword">=</span><span class="syntaxdefault">true<br /> </span><span class="syntaxcomment">#<br /></span><span class="syntaxdefault"> end<br /></span> -
You need to use camera.height in parallel mode.
-
Advertisement