The following tutorial/tips are mostly related to 3d architectural visualisation.
This part 1 series will begin with a photomontage/verified view technique to workout the vanishing lines of an architectural photograph. Also, it will focus on how to extend the Photoshop canvas dimensions in a non-destructive way,in order to correct the vertical shift of the camera/photo.
Following that, there will be a short step by step tutorial/description on how to correct 3d model size/dimension discrepancies in 3ds max.
The remaining tutorials, will take users through the processes of:
-Using the xref procedural material in 3ds max
-How to quickly correct 3d models with dll errors
-How to correct uvw map artifacts with inherited models
-Masking out trees/leaves in Photoshop
To create the vanishing line, simply set the line weight to a visible size (i.e. 5px) and begin creating it, by clicking and dragging it along.
It’s worth noting that, it’s imperative to duplicate layer prior to using the Crop tool in a non-destructive way
Next, click on the top part of the ruler and drag it down to create a guide.
Ensure the guide is positioned exactly where the vanishing lines meet.
To Crop extend the Canvas in a non-destructive way; first zoom out of the document/canvas and enable the Crop tool(C).
Next, drag down the Crop tool until its midpoint is positioned at the center of the guide (vanishing line).
Before Cropping (i.e. press Enter), ensure that the “Hide “option on the main toolbar is enabled, as opposed to “Delete”.
Once satisfied, simply press “Enter” to Crop extend the document/canvas.
Following that, create a rectangular selection around the extended area of the document with the marquee tool.
In addition, create a new layer( Ctrl+Shift+Alt+N), fill the selection with the Paint Bucket tool(G) and save the document as a PSD file.
This action is necessary to ennsure Photoshop "hides" the the extended area after Cropping it. Otherwise it will assume that, the extended area is empty without pixels/layers and subsequently delete/crop it...as opposed to hide it.
To see more tips and scripts for verified views, please visit this new post HERE
In such cases, the scale discrepancy is usually by a factor of 1.0.
To correct this artifact, simply do the following:
Setup so 1 Unit is equivalent to 1.0 millimeter, to reduce its overall size.
In addition, ensure that the Respect System Units in Files option is enabled.
Save and close the 3ds Max scene.
To access the pre-saved materials/shaders from a separate 3ds Max scene, one should click on the shader toggle and pick the XRef Material shader from the Material/map browser dialog list.
Once the XRef material shader is loaded, click on the File Name toggle to access the material/s and to select the relevant 3ds max file.
Once the XRef Merge dialog appears, select any of the materials previously created and re-named; followed by assigning it/them to various objects in the scene.
DLL errors from 3d objects in the scene
With 3d objects, is often a case of simply merging the object with artifact in a brand new 3ds Max scene, and re-saving the file to correct the dll error.
Erasing/masking out pixels behind tree leaves/branches for Photomontages
Until recently, undertaking the laborious task of erasing pixels behind tree leaves and branches could be considered to be any visualiser's nightmare.
For those who still do it the old fashion/tedious way, the following technique will definitely help speed up your workflow dramatically:
Without further ado, let's start by first duplicating the layer you'll be working on(Ctrl+J)
To help highlight the effect of this excellent Photoshop tool, we are going to use a red layer underneath the working document (i.e. underneath Layer 1).
To do so, create a new layer below the duplicated layer, and fill it out with the Paint Bucket tool.
To begin erasing the pixels behind the tree, simply go to the side tools and pick the Background Eraser Tool.
Also, choose the Sampling Once method and set the tolerance value to about 52%.
This value is a good starting point to target specific areas accurately. However, feel free to experiment with different values, if desired.
To customize the brush size and its softness/hardness, simply click on the Brush button, from the main toolbar and slide the relevant slider to either direction.
Prior to begin erasing pixels, first select the working document (i.e. Layer 1).
Next, target the pixel colour with a left click, and hold it down thereafter.
While holding down the left click, begin brushing away.
There will be areas of the image that will not be erased because its pixel colour differs from the initial targeted pixel .
To re-target new pixel areas, simply release holding down the left click, and left click on new pixel area, as previously done.
I hope you have found the tips somehow useful!
My 3D Portfolio:
Also, please check my New Book in this post Here: 3D Photorealistic Rendering: Interiors & Exteriors with V-Ray and 3ds Max
More tips & Tricks:
Tips & tricks for architectural Visualisation: Part 2
Essential tips & tricks for VRay & mental ray
Creating Customised IES lights
Creating a velvet/suede material