ANÁLISIS DE LA IMAGEN. Examen Universidad Nacional 1

The purpose of this video is to explain how a question on the subject of solid projections should be addressed on the admissions exam for the National University of Colombia. Image analysis explained in a clear, easy, and quick way. Hello and welcome to this video. In the following question taken from one of the admissions exams for the National University of Colombia, in the area of ​​image analysis related to the subject of solid projections, the statement reads: Identify the model that does not correspond to projections H and F on the left. Before beginning to deduce and justify the lines projected from the solids to identify which of these does not correspond to the proposed model, it is important to note that the frontal projection F corresponds to the one indicated by the arrow, and H to the platform or floor plan. This follows because the lateral projection, which would be L, could not be justified in any case with the model on the left. Once this clarification is made, we will proceed to justify the F projection in all options, noting that it would be perceptible for all. In Option A, we justify it with the square and the horizontal line that divides it in half. To demonstrate this, we rely on the software that has been used to recreate solids in 3D and thus validate the conclusions. We see that the projection is indeed consistent with the given model. Let's now look at Option B. We justify the square and the horizontal line that divides it in half. We now proceed to validate this observation with the three-dimensional model and verify that the lines are also justified. We now move on to observe Option C. It is also evident that the lines are justified for projection F of this solid, and we reconfirm it again with the 3D program. Note that the coincidence of the projection of the solid with the model to be identified is correctly demonstrated. Finally, we do the same for Option D; the square is justified with the horizontal line, as you can see, and then compared it with the solid constructed in 3D. In this way, we reconfirm that the projection given for F coincides in all options. So it's logical to infer that the distinctive feature that will allow us to find the correct answer option is in the platform or floor plan perspective. We follow the same procedure to justify lines as the one used in F. We see that in option A it coincides with the projection; observe the square and the horizontal line that divides it. Remember that irregularities or unevenness of the surface are not perceptible from perspectives constructed from a single vanishing point located at the center of the solid. We reconfirm this by observing the three-dimensional model. Note that the square is justified with its horizontal line... In option B, it is equally justified; it could be that this ascending line could lead someone to think that a division of the square would not be configured, perceiving that this ascending line is completely perpendicular, in which case they would be absolutely right in affirming that the square would not have a division in half. But note that this line segment slopes out from the floor toward the upper central part of the solid, meaning it is not perpendicular to the floor. This would then justify the edge of the square from the suspended line, which would be inaccessible to the observer in the position of the person taking the exam. Let's verify this with the 3D software. As you can see, what we concluded from the observation from the perspective on the paper is correct; we rotate the image and confirm what we had deduced from the given perspective. Continuing with option C, we justify the projection without any difficulty, just as in A. All the lines are visible to the observer taking the exam. We check it with the recreated 3D model and see that this is indeed the case... it matches. Finally, we see that the projection cannot be justified in option D, since the upward slope of this segment would make it possible to see the square fragmented into three parts from projection H; that is, with this solid, an additional horizontal line must be projected. If this line were completely vertical, that is, perpendicular to the floor, its projection would be identical to the other options. When we checked this on the 3D model, we found that this is the distinguishing feature that identifies the option where one of the projections doesn't match and leads us to choose the correct answer, which is option D. Contact us on our website: https://forprun.ga/