AccuRender nXt

advanced rendering for AutoCAD

"I'm usually rendering fairly detailed AutoCAD architectural models on 3D
modeled sites with lots of AccuRender trees and shrubs.  I was wondering
what AccuRender 4 (using Acad2004) and AccuRender nXt (using Acad2011)
actually "sees" when you select a view to render.  Do they "see" and have to
"consider" the 50 trees behind the building (adding a lot of calculating
time to a rendering), or do these programs "hide" and never consider the
stuff that's hidden in a view by other entities?"

Everything in the models takes time to render, so we recommend you use images for background trees, and only use fractal trees for tree for which the additional detail will make a difference.

The 3D Fractal Plants show more and more detail, the more you zoom in on them.

But for plants which are in the background, the 2D images work well and save considerable rendering time.

Here is a rendering of two plants - zoomed in - the one on the left is rendered as a 2D image, the one on the right is rendered as a 3D, Fractal plant. If you look closely you can see the better detail in the 3D, Fractal plant.

Rendered plants.jpg

However, when these two plants a zoomed out a bit the difference is almost not noticeable.

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Sounds like good method... something I need to look into as I've never used tree images.

Assuming I want to continue working the old way using only fractal trees... Does AutoCAD and AccuRender take time to calculate trees hidden by buildings etc?  I can see from the on-screen messages that go by, that the first step AccuRender does is to change all the AutoCAD render-able objects to faces.  I assume it converts all the objects in the model (including the hidden stuff).  Does it then use the "front row" of faces to hide the "back row" of faces?  If that's the case, I can see that turning off the trees that are hidden would save a lot of time.  (But then again... I charge by the hour!  Just kidding... I don't like wasting time.)

nXt doesn't really work like that-- all of the objects need to be taken.  An object which is hidden from view may show up in a reflection, a shadow, refracted through glass, contribute to diffuse reflection of light in the scene, etc..  

OTOH turning off objects which don't participate does not usually save a lot of time unless you are in a low-memory situation.

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Alfons Akamp replied to Alfons Akamp's discussion Flecken in Bilder
"Richtig, darum rendere ich im Standard Modus. Right, that's why I render in standard mode."
20 hours ago
David Richards replied to Alfons Akamp's discussion Flecken in Bilder
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Tuesday
Alfons Akamp replied to Alfons Akamp's discussion Flecken in Bilder
"Hallo David Das mag alles richtig sein, was Sie sagen. Für Einzelbilder ist es auch kein Problem da mal eben über Nacht 800 oder 1000 oder 1500 Passes zu machen. Aber was ist, wenn man eine Animation mit 250 - 300 Bilder rendert? Wenn…"
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David Richards replied to Alfons Akamp's discussion Flecken in Bilder
"This page on our site provides some insight into the performance of the different engines http://www.renderplus.com/wp2/wk/NXtRender_Rendering_Engines.htm#Hybrid_Engine_4"
Sep 18
Alfons Akamp posted a discussion

Flecken in Bilder

Ich habe da mal eine Frage:Wenn ich Bilder im Standard Modus rendere, sehen diese sehr gut aus.Wenn ich das gleiche Bild im Hybrid Modus rendere, habe ich jede Menge kleine weisse Punkte und Flecken in dem Bild.Warum und wieso kommen diese Flecken????I've got a question:When I render images in standard mode, they look very good.When I render the same image in hybrid mode, I have tons of tiny white spots and spots in the image.Why and why do these spots appear ????See More
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Aug 10
George Ioannidis commented on Peter Milner's photo
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"Very professionally looking render! Looks very photo-realistic."
Aug 10

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