我正在嘗試紋理球體。我的頂點(diǎn)著色器：attribute vec3 a_position;attribute vec3 a_normal;attribute vec3 a_texCoord0;uniform mat4 model;uniform mat4 view;uniform mat4 projection;uniform sampler2D u_texture;varying vec3 fragPos;varying vec3 normal;varying vec3 color;void main(){? ? gl_Position = projection * view * model * vec4(a_position, 1.0);? ? fragPos = vec3(model * vec4(a_position, 1.0));? ? normal = a_normal;? ? if(a_texCoord0.x > 50){? ? ? ? color = vec3(1f, 0.0f, 0.0f);? ? } else {? ? ? ? color = texture(u_texture, a_texCoord0);? ? }}我的片段著色器：#ifdef GL_ES? ? precision mediump float;#endifvarying vec3 normal;varying vec3 color;varying vec3 fragPos;uniform vec3 lightPos;uniform vec3 lightColor;void main(){? ? // Ambient? ? float ambientStrength = 0.1;? ? vec3 ambient = ambientStrength * lightColor;? ? // Diffuse? ? vec3 norm = normalize(normal);? ? vec3 lightDir = normalize(lightPos - fragPos);? ? float diff = max(dot(norm, lightDir), 0.0);? ? vec3 diffuse = diff * lightColor;? ? //vec3 result = (ambient + diffuse) * color;? ? vec3 result = color;? ? gl_FragColor = vec4(result, 1.0);}結(jié)果，我得到了可怕的紋理質(zhì)量損失。這是原始紋理和我在球體上得到的（這里只是立方體貼圖的一部分，其他面是紅色的）。我猜想這可能與構(gòu)建方法（來(lái)自二十面體）和紋理（使用立方體貼圖）的差異有關(guān)。但它可以解釋紋理邊緣不均勻，但不能解釋如此可怕的質(zhì)量損失。有人可以向我解釋這里發(fā)生了什么嗎？
1 回答
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發(fā)生這種情況是因?yàn)槟陧旤c(diǎn)著色器中對(duì)紋理進(jìn)行采樣，這意味著您只能在每個(gè)三角形的角上獲得三種顏色。其他像素被插值。
為了獲得更好的質(zhì)量，應(yīng)該將紋理采樣移動(dòng)到片段著色器，并且應(yīng)該插值 uv 坐標(biāo)而不是顏色：
頂點(diǎn)著色器：
attribute vec3 a_position;
attribute vec3 a_normal;
attribute vec3 a_texCoord0;
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
varying vec3 fragPos;
varying vec3 normal;
varying vec2 texcoord0;
void main()
{
gl_Position = projection * view * model * vec4(a_position, 1.0);
fragPos = vec3(model * vec4(a_position, 1.0));
normal = a_normal;
texcoord0 = a_texCoord0;
}
片段著色器：
varying vec3 normal;
varying vec2 texcoord0;
varying vec3 fragPos;
uniform sampler2D u_texture;
uniform vec3 lightPos;
uniform vec3 lightColor;
void main()
{
vec3 color = texture(u_texture, texcoord0).rgb;
// Ambient
float ambientStrength = 0.1;
vec3 ambient = ambientStrength * lightColor;
// Diffuse
vec3 norm = normalize(normal);
vec3 lightDir = normalize(lightPos - fragPos);
float diff = max(dot(norm, lightDir), 0.0);
vec3 diffuse = diff * lightColor;
//vec3 result = (ambient + diffuse) * color;
vec3 result = color;
gl_FragColor = vec4(result, 1.0);
}
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