Manually calculating z co-ordinates
Hi Guys, I am playing around with making a basic software driven 3D framework for learning purposes only. I know it will not be very performant. Hard one to explain, so hit me up with any questions if it isn't clear. I am manually calculating each point of a triangle, which I am drawing to the screen with lines. In the code snippet below, zero_x and zero_y are the co-ordinates of the centre of the window. So the positions are between -1 and 1 like DirectX etc... The triangle points have already been transformed in to 3D space against a World, View, and Projection matrix. np0x & y are the points in screen co-ordinates. np0x = (wvp[12] * zero_x) + zero_x; np0y = (wvp[13] * zero_y) + zero_y; Looping through each of the points to render a triangle with lines is working great (aspect ratio, position, etc.), however depth isn't working. If I set the camera z distance to any number, the triangle always renders the same size on the screen. I suspect that my calculations require wvp[14] (the z transform coordinate) to be multiplied in there as well to scale the x and y up and down. I have tried all sorts of combinations with wvp[14] value but am unable to get the triangle to render correctly when I do so. Any advice on this would be awesome. Thanks in advance.
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Hi Guys, I am playing around with making a basic software driven 3D framework for learning purposes only. I know it will not be very performant. Hard one to explain, so hit me up with any questions if it isn't clear. I am manually calculating each point of a triangle, which I am drawing to the screen with lines. In the code snippet below, zero_x and zero_y are the co-ordinates of the centre of the window. So the positions are between -1 and 1 like DirectX etc... The triangle points have already been transformed in to 3D space against a World, View, and Projection matrix. np0x & y are the points in screen co-ordinates. np0x = (wvp[12] * zero_x) + zero_x; np0y = (wvp[13] * zero_y) + zero_y; Looping through each of the points to render a triangle with lines is working great (aspect ratio, position, etc.), however depth isn't working. If I set the camera z distance to any number, the triangle always renders the same size on the screen. I suspect that my calculations require wvp[14] (the z transform coordinate) to be multiplied in there as well to scale the x and y up and down. I have tried all sorts of combinations with wvp[14] value but am unable to get the triangle to render correctly when I do so. Any advice on this would be awesome. Thanks in advance. https://ift.tt/eA8V8J September 09, 2019 at 07:21AM
from GameDev.net https://ift.tt/2ZSeVDn
Hi Guys, I am playing around with making a basic software driven 3D framework for learning purposes only. I know it will not be very performant. Hard one to explain, so hit me up with any questions if it isn't clear. I am manually calculating each point of a triangle, which I am drawing to the screen with lines. In the code snippet below, zero_x and zero_y are the co-ordinates of the centre of the window. So the positions are between -1 and 1 like DirectX etc... The triangle points have already been transformed in to 3D space against a World, View, and Projection matrix. np0x & y are the points in screen co-ordinates. np0x = (wvp[12] * zero_x) + zero_x; np0y = (wvp[13] * zero_y) + zero_y; Looping through each of the points to render a triangle with lines is working great (aspect ratio, position, etc.), however depth isn't working. If I set the camera z distance to any number, the triangle always renders the same size on the screen. I suspect that my calculations require wvp[14] (the z transform coordinate) to be multiplied in there as well to scale the x and y up and down. I have tried all sorts of combinations with wvp[14] value but am unable to get the triangle to render correctly when I do so. Any advice on this would be awesome. Thanks in advance. https://ift.tt/eA8V8J September 09, 2019 at 07:21AM
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