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@@ -1010,8 +1010,9 @@ for (int id_x = -width / 2; id_x < width / 2; id_x++){
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w1 = ((y2 - y0) * (id_x - x0) + (x0 - x2) * (id_y - y0)) / denominator;
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w2 = 1.0 - w0 - w1;
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- float z = w0 * z0 + w1 * z1 + w2 * z2;
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-
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+ float w_over_z = (w0 / z0 + w1 / z1 + w2 / z2);
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+ float z = 1.0 / w_over_z;
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+
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if (z < z_pixel){
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z_pixel = z;
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@@ -1052,8 +1053,8 @@ for (int id_x = -width / 2; id_x < width / 2; id_x++){
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switch (show_buffer){
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case 0:{
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- double ux = w0 * u_x0 + w1 * u_x1 + w2 * u_x2;
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- double uy = w0 * u_y0 + w1 * u_y1 + w2 * u_y2;
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+ double ux = (w0 * (u_x0 / z0) + w1 * (u_x1 / z1) + w2 * (u_x2 / z2)) / w_over_z;
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+ double uy = (w0 * (u_y0 / z0) + w1 * (u_y1 / z1) + w2 * (u_y2 / z2)) / w_over_z;
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int texture_width = texture_info[texture_index * 3];
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int texture_height = texture_info[texture_index * 3 + 1];
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iver