در این آموزش یک عکس HDRI را وارد نرم افزار میکند و در آن محیط یک ماشین رو به صورت واقعی قرار میده
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1.The point of view of HDRI map is always the central point of HDRI map sphere.
See Image 1







Image 1

















2. Its highest point is placed about 170cm from the ground.
Always take this value into consideration when placing objects on the HDRI map background.
See Image 2








Image 2

















3. Create a sample scene by loading the previously prepared objects.

In our example these objects are: a car and the ground in which the car shall be placed.
Create your own point of view which is the camera, keeping in mind that the correct location of objects should be relative to the surroundings which consists in HDRI map background.

See Image 3








Image 3

















4.
  • Load our HDRI map in the ‘Background’ section.
  • Turn the background on and set it so that it matches a selected location.
  • Set the ‘Intensity’ value according to your needs.
  • Set the same value in ‘Reflection’ as in ‘Background’ field.
  • Set the same value in 'Refraction' as in ‘Background’ field.
  • The value of 'Illumination' is disabled. It is responsible for illuminating our scene.

In our example the source of light is the sun which relates to the conditions in the background that is in HDRI map.
See Image 4












Image 4

















5. Set the location of the source of light i.e. the sun so that it corresponds to its location in the background of HDRI map.
See Image 5












Image 5

















6. This is a scene with a disabled view of HDRI map background.
See Image 6










Image 6

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7.The car is seen through the camera perspective.

The direction of sunlight is presented in the marked field.
See Image 7







Image 7

















8. A very important thing to remember: our ground is a simple geometrical figure that is an ordinary rectangle. It is necessary for generating the shadow cast by the car onto the ground.
See Image 8 & See Image 9










Image 8










Image 9

















9. Now switch the previously loaded HDRI background map so that it can be seen in the preview.
See Image 10








Image 10

















10. Remember that the 'the ground fabric' fields are marked as 'Shadow' and 'Matte'.

Now generate the shadow which the car casts onto the ground in a separate channel (image).
See Image 11












Image 11

















11. Render the images; the main picture and the picture of shadow channel.
( Optionally generate an additional image called the alpha channel: it depends on the need ,
so already generated the shadow must be without cropping: see section 13. )

Here are the resulting images:
See Image 12 & See Image 13








Image 12








Image 13

















12.
The final outcome after superimposing the images, after the so called 'post-processing'.
See Image 14








Image 14 - Click On Map to See in Larger Window

















13. The video below shows you how to merge images into one.
Download Video 1








Post processing with the GIMP












This tutorial is compatible with most 3D graphics applications.