I am looking for some help with creating areas/filling areas when I am doing some curved projection drawings.
I would like to show how the light will travel and hit onto the edges of the curved image which will sit onto a curved wall. The left hand side and right hand side are easy as I can draw lines from the center of the lens on the projector, to the corners of the image and Sketchup will automatically create the are, which can then set as a transparent fill to make it viewable.
How is it best to attack the bottom edge?! I have tried using a 2 point arc but the lines it create do not match the ones created by curving the flat screen size. There must be a clever way rather than drawing tonnes of straight lines from each part of the bottom and top back to the lens center?
I’m unclear of what you want to do… and this is a quick mockup - but if you want to see what the rectangular projection onto the wall would be - maybe something like this? I created a prism of what the projector might be putting out and then intersected the faces of the curved surface.
This is 16:9 - but I have no idea on the angle of view as that would change based on the throw of the projector and how it handles keystoning, etc. I’m sure someone smarter than me could point you to the math to figure it out if you had the specs from the projector.
That is an interesting way of doing it, I hadn’t begun to think of attacking it that way.
In your last image, would there then be a way to cut the cone of projection where it intersects with the wall? That way I could create the cone of projection true to is focal distance and throw ration and then pull and push until my projectors are in an ideal position know I am working within my projectors tolerance.
Not particularly, it was a “proof of concept/idea” visual more than anything.
Obviously straight from the projector, the image wont have it matching curves at top and bottom, that I will use geometry correction within the projector to achieve.
Yes, you could do what I did but intersect the prism instead of the curve. Either way would work.
It is not as simple as ‘push pull’ though - as you are dealing with a tapered shape. You might be able to do it with Fredo Joint Push Pull Vector Push Pull - otherwise you will be stretching / scaling the prism to get it right.
