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Description
A further demo of the Reality Fog prop rendered in Luxrender. Scene set up in Daz3a

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this carries on from the fog demo 03, [link] which used an alpha map in fron of a spot to simulate the light coming through trees which causes the beams through the volumetric fog prop. Each render is only 2 minutes about, at small size, only to demonstrate how fog works. As can be seen from the scene set up on the right, I have drastically scaled down the fog prop. The resulting top left render illustrates having a character positioned in the light beams; her shadow can be seen on the ground, so we know that she is blocking the light beams... so why can you not see the darkness in the beams where she is blocking the light? The reason is that there are beams in the fog between her and the camera as well, so the beams she is actually blocking are hard to see. (In the original fog demo 03, the beams you actually see are the ones on the edge of the light source, nearest the camera; for example, you cannot see the dark beam that forms the shadow in front of the gate, as there are beams of light in front of it...)

This is better illustrated in the second render, where I have narrowed down the spotlight beam. Here, we can still see the shadow of her head on the ground, but there is a large bright beam passing between her head and the camera, so it does not look as though she is blocking the light. However, her left hand and arm can be seen to clearly block the light, as there is no unblocked light between her arm and the camera due to the narrow beam. This can also be seen on the shadow on the ground; there is no light that is closer to us, the shadow of her arm dissolves into the general shadows...

If the alpha map is removed from the spotlight, the beam from the spot is clearly seen through the fog. It is now possible to see the beams caused by the character blocking the light... It does not appear as totally black beams due to there also being illuminated fog between her and the camera (I should have made the ground plane bigger, as the dark triangle bottom left is not shadow, it is the edge of the plane... `¬( ooops..!

It would only be totally black if her arm extended outside the light beam in the direction of the camera. (Outside of the light beam, the fog volume is not visible)

By moving the camera position to be inside one of the generated 'shadow beams' (if that makes sense) a dramatic effect can be seen, I illustrate this here... [link]

`¬)

Description
A further demo of the Reality Fog prop rendered in Luxrender. Scene set up in Daz3a

download full size

this carries on from the fog demo 03, [link] which used an alpha map in fron of a spot to simulate the light coming through trees which causes the beams through the volumetric fog prop. Each render is only 2 minutes about, at small size, only to demonstrate how fog works. As can be seen from the scene set up on the right, I have drastically scaled down the fog prop. The resulting top left render illustrates having a character positioned in the light beams; her shadow can be seen on the ground, so we know that she is blocking the light beams... so why can you not see the darkness in the beams where she is blocking the light? The reason is that there are beams in the fog between her and the camera as well, so the beams she is actually blocking are hard to see. (In the original fog demo 03, the beams you actually see are the ones on the edge of the light source, nearest the camera; for example, you cannot see the dark beam that forms the shadow in front of the gate, as there are beams of light in front of it...)

This is better illustrated in the second render, where I have narrowed down the spotlight beam. Here, we can still see the shadow of her head on the ground, but there is a large bright beam passing between her head and the camera, so it does not look as though she is blocking the light. However, her left hand and arm can be seen to clearly block the light, as there is no unblocked light between her arm and the camera due to the narrow beam. This can also be seen on the shadow on the ground; there is no light that is closer to us, the shadow of her arm dissolves into the general shadows...

If the alpha map is removed from the spotlight, the beam from the spot is clearly seen through the fog. It is now possible to see the beams caused by the character blocking the light... It does not appear as totally black beams due to there also being illuminated fog between her and the camera (I should have made the ground plane bigger, as the dark triangle bottom left is not shadow, it is the edge of the plane... `¬( ooops..!

It would only be totally black if her arm extended outside the light beam in the direction of the camera. (Outside of the light beam, the fog volume is not visible)

By moving the camera position to be inside one of the generated 'shadow beams' (if that makes sense) a dramatic effect can be seen, I illustrate this here... [link]

`¬)