What is the difference between virtual object and virtual image?
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I'm doing magnification and lens in class currently, and I really don't get why virtual and real images are called what they are.  A virtual image occurs the object is less than the focal length of the lens from the lens, and a real image occurs when an object is further than focal length.  By why virtual and real? What's the difference? You can't touch an image no matter what it's called, because it's just light.
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How can an Image-Empty be done with Python?  And how to set an image file on it? Object.data is None for empties, and there is no .image property on the object level either.
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What actually are ? In various places around physics SE, documentaries and occasional news headlines, I see the term "virtual particles", normally virtual photons.  I have tried researching it, but I'm not at a level of understanding yet to be able to grasp whats going on, if someone could explain it in a simple manner that would be great.
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I got this question when I received a code review comment saying virtual functions need not be inline.   I thought inline virtual functions could come in handy in scenarios where functions are called on objects directly. But the counter-argument came to my mind is -- why would one want to define virtual and then use objects to call methods?  Is it best not to use inline virtual functions, since they're almost never expanded anyway?  Code snippet I used for analysis:  class Temp { public:      virtual ~Temp()     {     }     virtual void myVirtualFunction() const     {         cout&lt;&lt;"Temp::myVirtualFunction"&lt;&lt;endl;     }  };  class TempDerived : public Temp { public:      void myVirtualFunction() const     {         cout&lt;&lt;"TempDerived::myVirtualFunction"&lt;&lt;endl;     }  };  int main(void)  {     TempDerived aDerivedObj;     //Compiler thinks it's safe to expand the virtual functions     aDerivedObj.myVirtualFunction();      //type of object Temp points to is always known;     //does compiler still expand virtual functions?     //I doubt compiler would be this much intelligent!     Temp* pTemp = &amp;aDerivedObj;     pTemp-&gt;myVirtualFunction();      return 0; }
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Is there any way to get blender to render on systems without a GUI?  Over the network on systems with a GUI?  I know of a service that will let you buy virtual servers that are charged by the hour, not the month, allowing to purchase extra performance on demand very cheaply!  The question itself is OS-agnostic, but in this case you can essentially respond in a any OS you would like.
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I know that they are both called 'virtual machines', but what is the exact difference?
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I was double checking my notes for 'Virtual Memory' and the definition in my text book is:     Process of allocating a section of secondary storage to act as part of the main memory   Where as  says:     Virtual memory is a computer system technique which gives an application program the impression that it has contiguous working memory (an address space)   and (Wikipedia also says)     Note that "virtual memory" is more than just "using disk space to extend physical memory size"   Can anyone offer any clarification as to which is correct?
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Since the vmware virtual machine drivers are pretty standard I don't see any technical reason for a preinstalled image not to be portable.  Although the above situation is obvious, I didn't find any preinstalled vmware image for Ubuntu.  Is there a trusted free vmware image or an OVF image with Ubuntu preinstalled?   Note: OVF image works !
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In optics it is widely mentioned real images are projectable onto screens whereas virtual ones can only be seen by a person.  Isn't that contradictory?  I mean in order to see the virtual image it has to be projected onto the retina (ultimately acting as a screen).   So, why can you see  in the first place?
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I understand from prior knowledge that there are two different image format / composition options available for creating images; raster and vector.  I would like to understand more about them, such as what the defining characteristics of each are, and what typical, generic use-cases each might have.       What are raster graphics composed of?   When would I want to choose raster over vector?       What are vector graphics composed of?   When would I want to choose vector over raster?
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When does the kernel of a function equal the image?  Thanks in advance
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We see a virtual inverted image whereas in case of concave mirror we can see a virtual image which is erect.
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I want to put a 2D image on a 3D object in Blender. How do I do that?  I have found the "textures" tab in the "properties" window, but I can't figure out what to do with it.  Preferably, I would like to click and drag an image off my desktop right onto the object.
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Functions such as os.path.exists(image.filepath) fail when Blender uses relative paths, This seems to be because Blender uses // prefix for relative paths, unlike the more conventional ./.  How can standard Python filesystem functions be used correctly on Blender paths?
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How does Cycles work and how is it different from Blender Internal?  Which is better?
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I have VirtualBox 4.3.6 and True Image 2014 Premium with Universal Restore. I've read a lot about different methods but I'm not sure where to start, or what will suit my needs.  Directly from  wiki:     Windows installations, unlike Linux, cannot easily be moved from one   hardware to another. This is not just due to Microsoft's activation   mechanism but the fact that the installed kernel and drivers depend on   the actual hardware.   This is where Universal Restore could come in handy. It is a feature of True Image that allows backups to be restored to dissimilar hardware.  I want a complete disk image backup of the system disk created with True Image before I do anything. I will then reformat the system disk. And then, instead of reinstalling Windows or restoring it from backup on the host, I would like to have it restored VirtualBox.  Is it possible to go from TIB (True Image Backup) to VDI (Virtual Disk Image)? If not at all possible, can I image the system disk (with current Windows install) with another tool and have it create a VDI image?  Then there is the Sysinternals Disk2vhd v2.01 by Mark Russinovich and Bryce Cogswell. But it creates a VHD image, rather than VDI image. There is also a limitation on how big the image can be.  Directly from  website:     Disk2vhd is a utility that creates VHD (Virtual Hard Disk -   Microsoft's Virtual Machine disk format) versions of physical disks   for use in Microsoft Virtual PC or Microsoft Hyper-V virtual machines   (VMs). The difference between Disk2vhd and other physical-to-virtual   tools is that you can run Disk2vhd on a system that’s online.      ...      Virtual PC supports a maximum virtual disk size of 127GB. If you   create a VHD from a larger disk it will not be accessible from a   Virtual PC VM.   My system disk is 190 GB. Is there an option inside this tool that would allow me to compress it to less than 127 GB? If not then I don't see how to do it, and I would rather not use VHD format anyway.  Can someone give me some pointers? How do I do this?
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I have an object with an hdr for the background. What do I do in Cycles to render the background with my object?  How is this different from an ordinary render in Cycles?  The hdr is a big one, 350MB.