The reflection starts at the point where the object touches the horizontal plane. So the reflection of the building begins where it meets the ground. There is a bit of shoreline in front of the house that prevents us from seeing the entire reflection. Notice the plant in the water at lower left edge of pond- it's reflection starts right where it meets the water. Look at the tree in the background- like the house it's reflection starts where it meets the ground, and is partially obstructed by the amount of land between it and the reflective water.
Look at the difference between the underside of the roof and it's reflection. the reason the reflection shows more of the underside is because the reflection is farther away from the horizon line.
Here is an exercise that illustrates the point. Notice that the planes are all paralell to each other and that we see more of their surface the farther away from the horizon line the plane is.
Three Point Perspective Continued.
Here is a good method for breaking up the surface of a plane in a three point view.
Once you've drawn a plane in three point perspective draw a vertical measuring line that attaches to the plane (A) then draw a diagonal from the far corner (B) through the upper left corner and meets the vertical (A). This becomes a vertical measuring line- divide it up at an appropriate scale and use point B as v.p. This 'transfers' the divisions on the vertical measuring line onto the tilted plane in the three point perspective. Now use those divisions and the v.p. on the horizon line for the 'horizontal' breakups on the tilted plane.
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