如何使用OpenGLES绘制ARFaceGeometry？

Question

我在我的iPhoneX上使用OpenGLES绘制ARFaceGeometry，我绘制了GL_POINTS并跟踪了我的脸部，但似乎不是正确的结果，有人请帮我找出哪里出错了？

这是我的绘图代码：

ARFaceGeometry *faceGeometry = [[ARFaceGeometry alloc] initWithBlendShapes:self.faceAnchor.blendShapes];

GLuint vertexBuffer;
glGenBuffers(1, &vertexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
glBufferData(GL_ARRAY_BUFFER, faceGeometry.vertexCount*3*sizeof(GLfloat), faceGeometry.vertices, GL_DYNAMIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);

GLuint textureCoordBuffer;
glGenBuffers(1, &textureCoordBuffer);
glBindBuffer(GL_ARRAY_BUFFER, textureCoordBuffer);
glBufferData(GL_ARRAY_BUFFER, faceGeometry.textureCoordinateCount*2*sizeof(GLfloat), faceGeometry.textureCoordinates, GL_DYNAMIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);

GLuint indexBuffer;
glGenBuffers(1, &indexBuffer);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, faceGeometry.triangleCount*3*sizeof(unsigned short), faceGeometry.triangleIndices, GL_DYNAMIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

[self.program setUniformMatrix4fv:@"u_pMatrix" value:self.projectionMatrix.m];
[self.program setUniformMatrix4fv:@"u_vMatrix" value:self.viewMatrix.m];
[self.program setUniformMatrix4fv:@"u_mMatrix" value:(GLfloat *)self.faceAnchor.transform.columns];
[self.program setUniform1i:@"maskTexture" value:[self.texture activeUnit:1]];
glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
[self.program setAttribute:@"a_vertex" size:3 stride:3*sizeof(GLfloat) offset:0];

glBindBuffer(GL_ARRAY_BUFFER, textureCoordBuffer);
[self.program setAttribute:@"a_texture_coord" size:2 stride:2*sizeof(GLfloat) offset:0];

glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer);
glDrawElements(GL_POINTS, (int)faceGeometry.triangleCount*3, GL_UNSIGNED_SHORT, 0);

glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

Answer 1

我发现vector_float3与simd_float4具有相同的大小和对齐。

所以我替换

results

与

glBufferData(GL_ARRAY_BUFFER, faceGeometry.vertexCount*3*sizeof(GLfloat), faceGeometry.vertices, GL_DYNAMIC_DRAW);

这解决了我的问题！