Cómo inicializar un glm::mat4 con una matriz?
Estoy usando la Biblioteca Matemática de OpenGL ( glm.g-truc.net ) y desea inicializar un glm::mat4
con una matriz flotante.
float aaa[16];
glm::mat4 bbb(aaa);
Esto no funciona.
Supongo que la solución es trivial, pero no se como hacerlo. No pude encontrar una buena documentación sobre glm. Le agradecería algunos enlaces útiles.
34
4 answers
Aunque no hay un constructor, GLM incluye funciones make_* en glm/gtc/type_ptr.hpp :
#include <glm/gtc/type_ptr.hpp>
float aaa[16];
glm::mat4 bbb = glm::make_mat4(aaa);
61
Author: Matthew Marshall,
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2011-09-13 20:38:14
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2011-09-13 20:38:14
También puede copiar directamente la memoria:
float aaa[16] = {
1, 2, 3, 4,
5, 6, 7, 8,
9, 10, 11, 12,
13, 14, 15, 16
};
glm::mat4 bbb;
memcpy( glm::value_ptr( bbb ), aaa, sizeof( aaa ) );
7
Author: Anderson Silva,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2013-07-15 14:31:18
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2013-07-15 14:31:18
Podría escribir una función de adaptador:
template<typename T>
tvec4<T> tvec4_from_t(const T *arr) {
return tvec4<T>(arr[0], arr[1], arr[2], arr[3]);
}
template<typename T>
tmat4<T> tmat4_from_t(const T *arr) {
return tmat4<T>(tvec4_from_t(arr), tvec4_from_t(arr + 4), tvec4_from_t(arr + 8), tvec4_from_t(arr + 12));
}
// later
float aaa[16];
glm::mat4 bbb = tmac4_from_t(aaa);
3
Author: bdonlan,
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2011-09-13 00:22:22
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2011-09-13 00:22:22
glm::mat4x4 view{ 2 / (right - left), 0, 0, 0,
0, 2 / (top - bottom), 0, 0,
0, 0, -2 / (farplane - nearplane), 0,
-((right + left) / (right - left)), -((top + bottom) / (top - bottom)), -((farplane + nearplane) / (farplane - nearplane)), 1
};
glm::mat4 view{ 2 / (right - left), 0, 0, 0,
0, 2 / (top - bottom), 0, 0,
0, 0, -2 / (farplane - nearplane), 0,
-((right + left) / (right - left)), -((top + bottom) / (top - bottom)), -((farplane + nearplane) / (farplane - nearplane)), 1
};
-1
Author: suraj kumar,
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2018-07-11 09:55:37
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2018-07-11 09:55:37