To all of you that are confused about the light source position, as mention in this tutorial i was showing how to project the shadows behind the structure and in order to do that the true light source has to be inverted left to right and up to down, if i wanted to project it in front of the structure i wouldn't need to do any invention just like the previous tutorial.
Since some people still have some problems with the light source I will try to clarify it with my words. Themodmin is in general right with his drawing regards the shadows and follows the explanation of Francis Ching. It is a bit tricky to understand that the light source seems to come from a "wrong" position. But this switch below the horizontal line is essential to construct the shadows in a proper way if the light source is BEHIND the observer. If the light source is in FRONT of the observer the shadows comes FROM the horizon (and become bigger the closer they are to the observer). You can draw guide lines directly FROM the light source. If the light source is BEHIND the observer the shadows point TO the horizon (and become smaler in the direction of the horizon). You can not draw guide lines from the light source. Therefore you have to switch the way the shadows are constructed. LS does not mean that the light source is at this position but the vanishing point for the light source. LS is not located right beside the house. You have to imagine the point LS is miles away and below the horizontal line (= under the surface of the earth). Maybe it is better to understand if you follow Francis Ching and rename the point called LS (Light Source) with VPLS (Vanishing Point for Light Source) and the point VPLS with VPB (Vanishing Point for Bearings).
That is the case in the video. There are ALWAYS two points related to the light. Where the light comes from (Light Source) and where the light goes (Vanishing Point for Light Source). If the light is in front of the observer you can use the light source itself. If the light comes from the back you have to use the Vanishing Point.
Your light source should be in the 11 o'clock position to produce the shadows the way you have drawn it. You do not have shadows on the elevation directly facing the light source.
Hi, Themodmin! Your tutorial is a pretty impressive one mostly because of your trying to help those who want to know more about the architectural drawing. So thumbs up for what you do!!! Unfortunately I do also have some comments about this video. First of all, it seems pretty much unnatural to have the light source under the horizontal line. Just as Jun Fu said, it is much more accurate and obvious for those who try to understand how to build shadows in perspective, to keep the light source above the horizontal line. What is more, I have a problem with the shadow cast by the overhang on the two horizontal layers..... it looks strange and it's not like that. It seems to me that you projected the shadow of the entire wall , but without that little "hook" there. The overhang must be seen in the shadow just as it is there.
The tutorial is pretty good, and despite what everybody is saying about the LS, it is correct. I have to point that the shadow in the second setup is wrong. You missed two of the object's points. Although, as a basic tutorial it's alright. Very good channel. Great work.
I agree with TheSezu, the point that you named light source should actually be called vanishing point of the shadows. It confuses people if you name it light source, because according to your shadows it can't possibly be a light source.
Hello, first of all I would like to tell you that it is really a very informative and good video. But I am not quite clear about one thing so I wanted to ask you. Why is the light source inverted in this video
Themodmin....a warm hello !!! This is so nice to learn and simple, but i notice some of your lines are incomplete and missing, i do really understood this inverted source of light and VPLS. It would be better if you would like to use straight edge or ruler to explain more properly. I notice the shadow at the back right corner(below), seems like you just draw it without explaining it properly and where's the point of intersection. This just a constructive critizm, please it would be nice if you redo it again with ruler and all the points would be projected from LS and VPLS....Thank you very much, hope this will explain more better.
Light hits the building and creates shadow? I don't understand, I think LS must be on other side of the building to create such shadow, please clarify if you can :(
Could you tell me. Does all the light source lines go to the (top 3 FROnt) points of the building and the vanishing point lines Always to the (bottom 3 points of the FRONT )of the building
If the light hits the object, the face on which it is hit should be lit: a shadow is cast whenever a light ray is obstructed by an object, meaning on the opposite side
I'm no architect just a novice artist. How are you getting shadows in front of the building when your light source is projecting forward? Shouldn''t your shadow be behind the building blocking the light on the opposite side? I'm confused.
I have to agree with what (almost) every one noted. There's no way to get those shadows, any of them where you placed the light source. Build a model and try it, if you disagree. Can I also suggest a ruler? I think while you might want to do a quick sketch and be loose, it's not the best way to make a tutorial.
Your shadows for this light source are incorrect. you have shadows facing the light source. that's not the way it works. Your light source should be coming from the left of the picture casting shadows on the right.
check out Architectural Graphics By Francis D. K. Ching page 182, light source position, as mention in this tutorial i was showing how to project the shadows behind the structure and in order to do that the true light source has to be inverted left to right and up to down, if i wanted to project it in front of the structure i wouldn't need to do any invention just like the previous tutorial.
Hi Themodmin, I checked as instructed above, Francis D. K. Ching's book, and at page 182, your Light Point is actually a Vanishing Point for light rays, which does make sense to me that the facades of the building you shaded with the alcohol marker are not facing the light source but are in the shadow ( hence using the marker for shading) .Light is coming from the upper left corner, and not as shown in the above example, from the lower right corner. Awaiting your comment . Regards
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To all of you that are confused about the light source position, as mention in this tutorial i was showing how to project the shadows behind the structure and in order to do that the true light source has to be inverted left to right and up to down, if i wanted to project it in front of the structure i wouldn't need to do any invention just like the previous tutorial.
Themodmin Thanks for the clarification. I was very confused. what you're showing is only a technique and the true light would not be exactly there.
You should ve mentioned it in the video bruh..
Anyways good content👍🏼
Since some people still have some problems with the light source I will try to clarify it with my words. Themodmin is in general right with his drawing regards the shadows and follows the explanation of Francis Ching. It is a bit tricky to understand that the light source seems to come from a "wrong" position. But this switch below the horizontal line is essential to construct the shadows in a proper way if the light source is BEHIND the observer. If the light source is in FRONT of the observer the shadows comes FROM the horizon (and become bigger the closer they are to the observer). You can draw guide lines directly FROM the light source. If the light source is BEHIND the observer the shadows point TO the horizon (and become smaler in the direction of the horizon). You can not draw guide lines from the light source. Therefore you have to switch the way the shadows are constructed.
LS does not mean that the light source is at this position but the vanishing point for the light source. LS is not located right beside the house. You have to imagine the point LS is miles away and below the horizontal line (= under the surface of the earth).
Maybe it is better to understand if you follow Francis Ching and rename the point called LS (Light Source) with VPLS (Vanishing Point for Light Source) and the point VPLS with VPB (Vanishing Point for Bearings).
Wow,how will it be with the light behind the observer😧
That is the case in the video. There are ALWAYS two points related to the light. Where the light comes from (Light Source) and where the light goes (Vanishing Point for Light Source). If the light is in front of the observer you can use the light source itself. If the light comes from the back you have to use the Vanishing Point.
@@n-and-a6280 i see!
Best shadow tutorial I've seen - excellent choice of form.
Your light source should be in the 11 o'clock position to produce the shadows the way you have drawn it. You do not have shadows on the elevation directly facing the light source.
even i felt the same. please clarify
Yeah thought the same but just read his comment, it'll be clear.
Cast shadow tutorial
ruclips.net/video/Ce0EGdmjSeg/видео.html
But i think if we reduce the distance bw LS And VP you will get that result which you want isn't it?
Hi, Themodmin! Your tutorial is a pretty impressive one mostly because of your trying to help those who want to know more about the architectural drawing. So thumbs up for what you do!!! Unfortunately I do also have some comments about this video. First of all, it seems pretty much unnatural to have the light source under the horizontal line. Just as Jun Fu said, it is much more accurate and obvious for those who try to understand how to build shadows in perspective, to keep the light source above the horizontal line. What is more, I have a problem with the shadow cast by the overhang on the two horizontal layers..... it looks strange and it's not like that. It seems to me that you projected the shadow of the entire wall , but without that little "hook" there. The overhang must be seen in the shadow just as it is there.
The tutorial is pretty good, and despite what everybody is saying about the LS, it is correct.
I have to point that the shadow in the second setup is wrong. You missed two of the object's points. Although, as a basic tutorial it's alright.
Very good channel. Great work.
I agree with TheSezu, the point that you named light source should actually be called vanishing point of the shadows. It confuses people if you name it light source, because according to your shadows it can't possibly be a light source.
Thank you soo much.. was very difficult to find a video on this technique
Все доступным простым языком и интересно к тому же. спасибо
Excellent! Thanks.
Hello, first of all I would like to tell you that it is really a very informative and good video. But I am not quite clear about one thing so I wanted to ask you.
Why is the light source inverted in this video
L is the light rays vanishing point
Themodmin....a warm hello !!! This is so nice to learn and simple, but i notice some of your lines are incomplete and missing, i do really understood this inverted source of light and VPLS. It would be better if you would like to use straight edge or ruler to explain more properly. I notice the shadow at the back right corner(below), seems like you just draw it without explaining it properly and where's the point of intersection. This just a constructive critizm, please it would be nice if you redo it again with ruler and all the points would be projected from LS and VPLS....Thank you very much, hope this will explain more better.
Hey Themodmin, thank you for your tutorial:)
Sorry, but why it seems the LS should be above the horizontal line on the left?
+Jun Fu I also have the same confusion!
This us hard stuff,need more examples
Hi .could you possibly do the shadows of the buildings in 3 seperate drawings. I get so confused with all the lines . Thank you
Ur awesome. 😍😍😍
Light hits the building and creates shadow? I don't understand, I think LS must be on other side of the building to create such shadow, please clarify if you can :(
This one is hard to understand. Please post more examples
Could you tell me. Does all the light source lines go to the (top 3 FROnt) points of the building and the vanishing point lines Always to the (bottom 3 points of the FRONT )of the building
Even if the light source is in the front ,side or back
I feel a strong intuition against the procedure that was carried out in this video. The shadows should be cast behind the object, not in front of it
Why not?
If the light hits the object, the face on which it is hit should be lit: a shadow is cast whenever a light ray is obstructed by an object, meaning on the opposite side
+Nikklas57 Yes I see what you mean, in regard to the last 3 models. The first 2 seem fine.
I'm no architect just a novice artist. How are you getting shadows in front of the building when your light source is projecting forward? Shouldn''t your shadow be behind the building blocking the light on the opposite side? I'm confused.
this is wrong . tHe direction of the shadow should be different. please clarify.
I have to agree with what (almost) every one noted. There's no way to get those shadows, any of them where you placed the light source. Build a model and try it, if you disagree.
Can I also suggest a ruler? I think while you might want to do a quick sketch and be loose, it's not the best way to make a tutorial.
what pen did you use for the shadow casting?
+Marco du Toit pilot pen
Your shadows for this light source are incorrect. you have shadows facing the light source. that's not the way it works. Your light source should be coming from the left of the picture casting shadows on the right.
check out Architectural Graphics By Francis D. K. Ching page 182, light source position, as mention in this tutorial i was showing how to project the shadows behind the structure and in order to do that the true light source has to be inverted left to right and up to down, if i wanted to project it in front of the structure i wouldn't need to do any invention just like the previous tutorial.
Hi Themodmin, I checked as instructed above, Francis D. K. Ching's book, and at page 182, your Light Point is actually a Vanishing Point for light rays, which does make sense to me that the facades of the building you shaded with the alcohol marker are not facing the light source but are in the shadow ( hence using the marker for shading) .Light is coming from the upper left corner, and not as shown in the above example, from the lower right corner. Awaiting your comment . Regards
@@TheCezu Legend has it he's still waiting for the response
really confusing.....
very confused